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CZE-MS/MS data of the HepG2 sample regarding PTMs. (A) Distribution of some modifications on the identified proteoforms. Sequences and fragmentation patterns of some proteoforms (B) with one phosphorylation site and N-terminal acetylation, (C) with two phosphorylation sites, and (D) with phosphorylation and acetylation on the N-terminal serine residue.
