I went through these steps again and I am still getting the same error and 
everything in spectrast.

On Wednesday, August 31, 2016 at 11:04:39 PM UTC-4, Ali wrote:
>
> Thank you so much Eric for helping me. Let me tell you what I have done 
> before this:
>
>
>    - I have done the search with *TMT 10 plex of K* and *TMT 10plex of N 
>    term* fixed residue modification in *X!Tandem*. The Enzyme was 
>    Trypsin. I set the mass modification in X!Tandem as:
>    - <note label="residue, modification mass" 
>    type="input">229.1629@K,229.1629@[</note>
>
>
>    - Then I converted the results of X! Tandem to pep.xml (Using 
>    Tandem2XML)
>
>
>    - Next I got the probabilities with the following setting:
>    - PeptideProphetParser 1607011A_NC20A_10ul_180min.tandem.pep.xml 
>    ACCMASS PPM NOICAT MINPROB=0.05
>
>
> and then I wanted to convert the result to splib that I encountered this 
> error. The modifications that spectrast gives me did not make sense to me 
> too. Do you have any idea what might have happened here?
>
> I am going to redo the search to see if anything changes.
>
> Thanks again!
>
>
>
> On Wednesday, August 31, 2016 at 10:21:17 PM UTC-4, Eric Deutsch wrote:
>>
>> Ah, one other idea. n[272] is probably n[230] plus n[42]. I suppose 
>> that’s TMT6plex plus Acetylation. Is that possible? If so, then maybe we 
>> need to teach SpectraST about it. But the relative ratios of the numbers I 
>> quoted below are still quite odd and raises a red flag. Is there a reason 
>> to expect so few peptides ending in lysine. Maybe it’s all fine.
>>
>>  
>>
>>  
>>
>> *From:* Eric Deutsch [mailto:[email protected]] 
>> *Sent:* Wednesday, August 31, 2016 7:15 PM
>> *To:* [email protected]
>> *Cc:* Eric Deutsch <[email protected]>
>> *Subject:* RE: [spctools-discuss] Re: Problem when Creating a library in 
>> Spectrast
>>
>>  
>>
>> As the error message suggests, SpectraST doesn’t know about the 
>> modification you specified:
>>
>>  
>>
>> Peptide ID has unknown modification: "n[272]CPRAAR".
>>
>>  
>>
>> n[272] is not known. I thought TMT6plex is n[230]. You seem to be adding 
>> a very different mass to the n terminus than the TMT6 that I know, or I’m 
>> confused. Maybe your n-terminal mass mod is wrong? Or maybe you’re not 
>> using TMT6?
>>
>>  
>>
>> The other numbers you show are very puzzling:
>>
>>  
>>
>> E,Glu->pyro-Glu: 215
>>
>>                   K,TMT6plex: 197
>>
>>                   Q,Gln->pyro-Glu: 101
>>
>>                   n,TMT6plex: 2879
>>
>>  
>>
>> K,TMT6plex should be about half of n,TMT6plex and it’s not. And a 
>> scenario where E,Glu->pyro-Glu is greater than K,TMT6plex is hard to 
>> fathom. These relative counts don’t make sense.
>>
>>  
>>
>> I suggest checking your mass mods for the original search very carefully 
>> and redoing the search.
>>
>>  
>>
>> Regards,
>>
>> Eric
>>
>>  
>>
>>  
>>
>>  
>>
>> *From:* [email protected] [mailto:[email protected]] 
>> *On Behalf Of *Ali
>> *Sent:* Wednesday, August 31, 2016 5:52 PM
>> *To:* spctools-discuss <[email protected]>
>> *Subject:* [spctools-discuss] Re: Problem when Creating a library in 
>> Spectrast
>>
>>  
>>
>> Here there is more detail:
>>
>>  
>>
>> Total number of spectra in library: 2879
>>
>> Total number of distinct peptide ions in library: 2349
>>
>> Total number of distinct stripped peptides in library: 2298
>>
>>  
>>
>> CHARGE            +1: 0 ; +2: 2098 ; +3: 781 ; +4: 0 ; +5: 0 ; >+5: 0 ; 
>> Unk: 0
>>
>> TERMINI           Tryptic: 2404 ; Semi-tryptic: 462 ; Non-tryptic: 13
>>
>> PROBABILITY       >0.9999: 61 ; 0.999-0.9999: 1236 ; 0.99-0.999: 936 ; 
>> 0.9-0.99: 421 ; <0.9: 225
>>
>> NREPS             20+: 0 ; 10-19: 0 ; 4-9: 0 ; 2-3: 0 ; 1: 2879
>>
>> MODIFICATIONS     E,Glu->pyro-Glu: 215
>>
>>                   K,TMT6plex: 197
>>
>>                   Q,Gln->pyro-Glu: 101
>>
>>                   n,TMT6plex: 2879
>>
>>  
>>
>>
>>
>> On Wednesday, August 31, 2016 at 8:48:09 PM UTC-4, Ali wrote:
>>
>> Hi
>>
>>  
>>
>> I want to create a library from a pep.xml file which is the result of X! 
>> Tandem search (I converted the X!Tandem to pep.xml using Tandem2XML) using 
>> spectrast with the following simple command:
>>
>>  
>>
>> spectrast -cN1607011A_NC20A_10ul_180min.splib -cP0.9 
>> 1607011A_NC20A_10ul_180min.tandem.pep.xml
>>
>>  
>>
>> I receive the following error:
>>
>>  
>>
>> SpectraST finished at Wed Aug 31 15:08:36 2016 with 195 error(s):
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]CPRAAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.02812.02812.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MAAAAAQGGGGGEPR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.02849.02849.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MSGGGGGGGSAPSR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.03003.03003.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGGGQR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.03085.03085.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGLLGR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.03108.03108.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGGGQR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.03354.03354.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MAAAAGGGSCPGPGSAR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.03413.03413.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MATANGAVENGQPDR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.03452.03452.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGLVAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.03464.03464.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]LAGGVR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.03465.03465.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MSVQVAAPGSAGLGPER". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.03771.03771.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]DAGSER". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.03826.03826.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]LAGGVR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.03846.03846.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]IIGPRGPGSQR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.03857.03857.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]RRPRQGGGGAGGSAAAR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.03870.03870.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]APGVAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.03873.03873.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]PPCSGGDGSTPPGPSLR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.03903.03903.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MNNAGHGPTRR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.03906.03906.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]VSSGCR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.04014.04014.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]EDAAAPGR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.04033.04033.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ATGGDDPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.04047.04047.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]DGGAASQDESSAAAAAAADSR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.04240.04240.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ACAGSTR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.04383.04383.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGGGGSALR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.04389.04389.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]LASGPAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.04425.04425.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]DASGRAAAEGWR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.04557.04557.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MHPAGLAAAAAGTPR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.04586.04586.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PEAGATLR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.04738.04738.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MGTAAAAAAAAAAAAAGEGAR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.05039.05039.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAAGPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.05094.05094.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PGGPSPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.05100.05100.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]ERGGAGGGPGGAGGGSGQR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.05205.05205.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]ERGGAGGGPGGAGGGSGQR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.05214.05214.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]ERGGAGGGPGGAGGGSGQR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.05221.05221.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]ERGGAGGGPGGAGGGSGQR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.05235.05235.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]GTAAAAAAAAAAAAAGEGAR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.05378.05378.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GAAGSDGR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.05586.05586.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MSVQVAAPGSAGLGPER". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.05662.05662.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAPPAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.05706.05706.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAPVAAGSGAGR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.05716.05716.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MAAAAGGGSCPGPGSAR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.05833.05833.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGSVGSQR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06095.06095.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAAAQSR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06135.06135.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGSGAGVR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06378.06378.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MDSGAGGRR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06449.06449.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MGRAAATAGGGGGARR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.06460.06460.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MSSGGGSR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06471.06471.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]DPAPAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06521.06521.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGPGPSR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06526.06526.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SSCSGLSR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06577.06577.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PGGAGAAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06584.06584.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GFGPGLTAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06635.06635.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MEPGSAEMPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06742.06742.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MRSGAAPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06824.06824.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SGAAGAAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06871.06871.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]AAAAAGLGGGGAGPGPEAGDFLAR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.06879.06879.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GAAAESGR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06903.06903.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAVAAALAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06951.06951.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAIPALD". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.06954.06954.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGTTSTRR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.07004.07004.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAGAAPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.07207.07207.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MASDAVQSEPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.07208.07208.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MAAPAGGGGSAVSVLAPNGR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.07211.07211.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]FGGPGPGVLGAQGMAGPLR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.07272.07272.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]RPLAGGSR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.07288.07288.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SGAAGAAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.07350.07350.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGGCAGSR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.07380.07380.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PSGEER". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.07404.07404.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MSAPVGPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.07444.07444.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ATSGDCPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.07583.07583.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGPGPSR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.07610.07610.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAEGGFD". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.07708.07708.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AVCGGAAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.07724.07724.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]VSVPGPAAAAAPAAGR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.07838.07838.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SPAAAAAGAGER". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.07988.07988.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MSPGASR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08063.08063.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAGAGAPGNPED". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08072.08072.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAGAGAPGNPED". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08094.08094.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]DGVAGPQLGAAAEAAEAAEAR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.08098.08098.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGAWGR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08180.08180.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MPGEAAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08206.08206.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]AAPYPGSGGGSEVK[357]". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.08321.08321.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MAVAVGVRAAPVLGLAR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.08406.08406.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGSGAGVR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08430.08430.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGSGAGVR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08433.08433.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SPEAQPQR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08477.08477.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SGFSTEER". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08492.08492.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GNAPSQD". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08511.08511.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGGVCVGR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08531.08531.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGSGAGVR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08548.08548.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAVAGMLR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08552.08552.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]EAAVGVPDGGDQGGAGPR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.08642.08642.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAGGAASR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08768.08768.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ALNVAPVR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08854.08854.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MAAAEEGCSVGAEADR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.08971.08971.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PGILVGGAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.08998.08998.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAGAAVAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09035.09035.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MHGGGPPSGDSACPLR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.09094.09094.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]AAQGVGPGPGSAAPPGLEAAR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.09099.09099.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAAGGAASR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09119.09119.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SGAAGAAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09199.09199.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAEER". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09255.09255.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]PGILVGGAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09269.09269.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGAWGR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09348.09348.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]TGGAHSR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09380.09380.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]PNCSCAAGVSCTCASSCK[357]". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.09414.09414.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GPVPSR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09426.09426.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MPGGPSPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09537.09537.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGAWGR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09639.09639.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]AGPGSTGGQIGAAALAGGAR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.09659.09659.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGSGAGVR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09694.09694.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]GGGPSGGGPGGSGR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.09722.09722.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]GGGPSGGGPGGSGR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.09723.09723.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAGGSAPEPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09727.09727.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGGEQEEER". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09733.09733.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAGGSAPEPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09746.09746.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAGGSAPEPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09782.09782.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGSGAGVR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09801.09801.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAGGSAPEPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09855.09855.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GVSALLAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.09869.09869.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]GGGPSGGGPGGSGR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.09906.09906.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SGAGGRR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.10082.10082.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]AAAAAAAAAAGAAGGR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.10143.10143.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]AAAAAAAAAAGAAGGR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.10163.10163.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]AAAAAAAAAAGAAGGR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.10324.10324.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]AAAAAAAAAAGAAGGR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.10369.10369.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MPGPPALR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.10601.10601.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]GGGPSGGGPGGSGR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.10854.10854.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]GGGPSGGGPGGSGR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.10855.10855.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MASEASVR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.10910.10910.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]GGGPSGGGPGGSGR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.10933.10933.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAAVGSGGYAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.10976.10976.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MSSEDR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.10991.10991.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]SGAAGAAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.11115.11115.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MASATED". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.11259.11259.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ASVAAAARR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.11363.11363.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AELGAGGDGHR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.11367.11367.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AELGAGGDGHR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.11369.11369.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MEEGAPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.11427.11427.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGSDPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.11445.11445.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]FLLGLR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.11584.11584.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]AGGGGGSSK[357]". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.11673.11673.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]LPPPPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.11826.11826.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGSDPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.11957.11957.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]ELGAGGDGHR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.12159.12159.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]GAAGAGAPGNPED". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.12280.12280.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MELGGPGAPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.12308.12308.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGAWGR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.12420.12420.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MELGGPGAPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.12496.12496.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGGSDPR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.12559.12559.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MASASGAMAK[357]". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.12580.12580.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GRAGGGGPGR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.12788.12788.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MSELADSGPSGASAPSQLR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.12809.12809.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GSGGGAGER". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.13091.13091.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MATSGANGPGSATASASNPR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.13144.13144.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]ANGDSPPWSPALAAEGRGSSCEVR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.13183.13183.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MAGAGSEAR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.13366.13366.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]RSPGGILLQALPR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.13403.13403.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MGVALR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.13432.13432.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MATSFR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.13484.13484.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MTEPGASPED". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.13555.13555.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MTEPGASPED". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.13607.13607.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GGAGGGPGLR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.13613.13613.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]MTEPGASPED". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.13725.13725.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]AALHTTPDSPAAQLER". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.13774.13774.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AAAGPSTR". 
>> Skipped spectrum 1607011A_NC20A_10ul_180min.13888.13888.2 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]RSGGGCSGSLSLR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.14320.14320.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]ATVVDAVNAAPLSGSK[357]". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.14447.14447.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MEAAFGQVAGSACPRR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.14956.14956.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MAASAGAGAVIAAPDSR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.15253.15253.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MGGAGALGGAGGVQGAAGR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.15317.15317.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]TTFLQTSSSTFGGGSTR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.15616.15616.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MLPWTALGLALSLRLALAR". Skipped spectrum 
>> 1607011A_NC20A_10ul_180min.16176.16176.3 .
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MASGAGGVGGGGGGK[357]"
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MVK[357]EGAAVIDVGINYV
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MRQGLLVLALVLVLVLVLAAG
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]AAIYGGVEGGGTR". Skipp
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]LGSDDFFYVGGSPSTADLPGS
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]EGGPAVCCQDPRAELVER".
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]AAAAMAAAAGGGAGAARSLSR
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]LNGGGSGAGGSRGGGQER".
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]RRALLLLLLSFLAPWATIALR
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]APGALAQTAAPGPGR". Ski
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MAGDLSAGFFMEELNTYR".
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]GAAARLSAPR". 
>> Skipped
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]SSYDEASLAPEETTDSFWEVG
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]APRALPGSAVLAAAVFVGGAV
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MSHYGSYYGGLGYSCGGFGGL
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MDGASSGGGGSSEGGGGSSGS
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: "n[272]AGAAAGGR". 
>> Skipped sp
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]SCARLLLLWGCTVVAAGLSGV
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]ASTSRDVIAGRGIHSK[357]
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]TESASCSTARQTK[357]".
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]MARAGWTGLLPLYVCLLLTCG
>>
>> PEPXML IMPORT: Peptide ID has unknown modification: 
>> "n[272]AAAAPAAAAASSEAPAASATA
>>
>>  
>>
>>  
>>
>> Does any body knows what might be the problem? I am relatively new in TPP 
>> and proteomics so I would appreciate if you could explain a little in 
>> detail.
>>
>>  
>>
>> Thank you very much
>>
>>  
>>
>> -- 
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>>
>

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