282574.fig.0018a
(a)
282574.fig.0018b
(b)
282574.fig.0018c
(c)
Figure 18: CID-MS/MS spectra of different protonated forms of the peptide HSDAVFTDNYTR: (a) CID of singly protonated peptide [M + H]+, (b) CID of doubly protonated peptide [M + 2H]2+, and (c) CID of triply protonated peptide [M + 3H]3+. (Reprinted with permission from Analytical Chemistry [157], Copyright 1993, American Chemical Society).