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MS/MS of peptide GAAGLPGPKGERGDAGPK. Panel (a) shows the fragmentation of native peptide (red) and the modified peptide with 1 methacrylate on lysine in C-terminal position (blue). Panel (b) shows the fragmentation of native peptides (red) and peptides with all methacrylated lysines (green). (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
