Hi guys,

Back here after a long break :-) I want to use the TPP for
quantitation of metabolic labeling experiments - both 14N/15N and 12C/
13C. I have two questions:

1.) Is it possible to use 13C labeling with either XPress or
ASAPRatio? I've found only options for 15N, so is there any chance to
process 13C-labeled samples?

2.) How to perform the searches (Mascot in my case)? As far as I
understood I have to search each sample twice - once for the light and
once for the heavy peptides. That means to modify the masses and
modification files on the Mascot server for every heavy search, so it
is quite uncomfortable, especially if the Mascot server is shared with
a lot of other people... With version 2.2, Mascot offers an option for
metabolic labeling, resulting in the identification of light and heavy
peptides in one run. Is it possible to process such a combined result
file through the TPP?

Thanks for any help!

 - Matthias
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