Hello,

I just realized a possible issue I've been having when using Comet to 
perform a concatenated decoy search on my .mzml file. I just noticed that 
the decoy matches are being displayed/outputted in different ways.

In both the .pep.xml and .pin output files (I need to run Percolator 
after), the decoy hits are being displayed as one of the 3 forms (i.e. all 
3 forms are present in the same file):

DECOYsp|Q8IZQ1|WDFY3_HUMAN
DECOY6157
DECOYDECOY9389

When I check back in the .fasta file, the DECOYDECOY results are reversing 
the decoys (so they become the original forward peptides), which is wrong. 
I'm not sure why I'm getting all 3 forms, especially the DECOYDECOY matches 
in the output files. My .fasta is a concatenated version of the forward and 
reverse (decoy) peptides.

What's more interesting is that when I convert the .pep.xml file to .mzID 
so I can further process the results, the .mzID does not contain any 
DECOYDECOY entries.

Very confused as to what is happening and any help would be much 
appreciated. I would especially like to sort out this issue I'm having with 
Comet.

Thanks,

Francesca

PS. I have also uploaded the .params file for Comet in case there is an 
error in there.

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Attachment: comet_hiRes.params
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