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Figure 2 | Proteome Science

Figure 2

From: The sea urchin (Strongylocentrotus purpuratus) test and spine proteomes

Figure 2

Mass spectrum of a collagenous peptide with hydroxyproline in X and Y position of the Gly-X-Y triplet. The MS/MS spectrum showed a y-ion series with an increase of 16 Da starting with y7 and 32 Da starting with y11 indicating hydroxylation of prolines five and nine of the sequence GPGGPAGPPGEAGSR. This was confirmed by a less complete b-ion series.

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