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Postulated fragmentation pathways for the MS3 fragmentation of the y2 fragment ions of the following products: 5-h-Gly[αC] (m/z are black colored), 5-d-Gly[αC] (m/z are blue colored), 7-h-Gly[αC] (m/z are red colored). The red-colored atoms indicate the position of 15N and 13C when GSH* is used to explain the fragmentation mechanism. The blue-colored atoms indicate either the use of a protonated acetyl radical (X=H) or a deuterated acetyl radical (X=D).
