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(A) LC/ESI-MS analysis of the peptide mixture obtained from endoproteinase Asp-N hydrolysis of the 4-h incubation mixture. Fractions containing modified GAPDH peptides are numbered. Peptides present in the numbered fractions are shown. Peptides containing cross-links with SubP are shown in boldface. (B) Transformed ES mass spectrum of fraction 1. Assignments of the mass signals to the corresponding peptides are shown.
