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Tandem mass (MS/MS) spectra of doubly charged precursor ions of the peptide LK199CASLQK. (A) Unmodified peptide, m/z 445.75971; (B) N(6)-formyl adduct, m/z 459.75657, with ^ indicating a nominal mass increase of 28; (C) Lys199-crosslink adduct, m/z 451.75966, with # indicating a nominal mass increase of 12; and (D) N(6)-acetyl adduct, m/z 466.76566, with * indicating a nominal mass increase of 42.
