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. 2004 Sep 16;54(4):359–371. doi: 10.1007/s00262-004-0592-y

Fig. 3.

Fig. 3

SRM mass spectrometric detection of ALLAVGATK. Single ion chromatograms (SIC) for three product ions of ALLAVGATK are shown. The product ions observed for the synthetic peptide and each of the purified peptide samples have equal retention times and b2/y5/y7 ratios, indicating that ALLAVGATK is present in each of the samples. *Indicates that the ratio is high due to ion contribution from the internal standard deuterium-labeled ALLAVGATK (the contribution of the internal standard is observed in the b2 product ion because the mass of b2 for both the deuterium-labeled and non-deuterium-labeled peptides is 185.4).