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Tandem mass spectrometry. (A) Collision-induced fragmentation of the simply charged ion at m/z=779.3 corresponding to the N-terminal blocked peptide Q6 of HML (Fig. 5 ▶). Sequence-specific b and y ions used for structure determination are indicated. (B) The full (MS)3 spectrum and sequence assignment of the b2 ion at m/z=240.1 produced by MS/MS of the peptide ion Q6 shown in A. (F) Immonium ion of phenylalanine at m/z=120.1. (Z) Pyroglutamic acid.
