Hi Eric,

We use these elements to detect which modifications that are fixed and 
which that are variable. I don't see how we could extract this information 
without the aminoacid_modification elements? As this information is not 
part of the mod_aminoacid_mass elements? Or is there something I'm missing?

Best regards,
Harald




On Wednesday, August 10, 2016 at 9:44:09 PM UTC+2, Eric Deutsch wrote:

> Hi everyone, I have a question about use of some pepXML tags. It’s a bit 
> technical and mostly for other developers who use the pepXML format.
>
>  
>
> The issue involves the amino_acid tags at the top of a pepXML file under 
> search_summary, like this:
>
> <search_summary">
>
>   <aminoacid_modification aminoacid="M" massdiff="15.994915" 
> mass="147.035400" variable="Y" symbol="*"/>
>
>   <aminoacid_modification aminoacid="S" massdiff="79.966331" 
> mass="166.998359" variable="Y" symbol="#"/>
>
>  
>
> Comet and some other search engines write out these entries for the 
> specified search mass mod parameters.
>
>  
>
> But SpectraST at least does not put these there, in part because it 
> doesn’t really know what mods will appear in later in the file, because it 
> depends on the library. And we now have another case where it is awkward to 
> put them at the top of the file because they’re not an input parameter, but 
> a result of the reference.
>
>  
>
> So the question to all is: does anyone use these data elements at the top 
> for something important? Would it cause any troubles if for some search 
> results they are not there or are incomplete? As currently for SpectraST?
>
>  
>
> What do you think?
>
>  
>
> Thanks,
>
> Eric
>
>  
>
>  
>
>  
>
>  
>

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