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MS/MS profile of the tryptic peptide LSVEALNSLTGEFK from creatine kinase M. (A) The top MS/MS is from a control sample with an elution at 46.3 minutes. (B) The bottom MS/MS is from the GFAP transgenic sample with an elution at 46 minutes. These tandem MS spectra show instrument reliability and consistent fragmentation patterns which are necessary for spectral counting analysis.
