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LC/MS analyses performed on peptide 6 treated with β-propiolactone. Two products (I and II) were observed by LC/MS containing one attachment of β-propiolactone. MS2 analyses revealed the peptide sequence of both products and the β-propiolactone modification of lysine residue (I). Product I is probably peptide 6 with an alkylated lysine residue and product II with an acylated lysine residue.
