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CZE-MS/MS data of the HepG2 sample regarding histone proteoforms. (A) Distribution of the identified histone proteoforms as a function of major histone variants. Sequences and fragmentation patterns of three H4 proteoforms with (B) a 28 Da mass shift, (C) a 28 Da mass shift, and (D) a 337 Da mass shift. Sequences and fragmentation patterns of (E) histone H2A type 1-J proteoform with a 122 Da mass shift and (F) histone H2A type 1 proteoform with an 83 Da mass shift.
