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Five variable PTMs used in the identification of proteoforms of histone proteins
| PTM | Monoisotopic mass shift (Da) | Amino acids |
|---|---|---|
| Acetylation | 42.01056 | R, K |
| Methylation | 14.01565 | R, K |
| Dimethylation | 28.03130 | R, K |
| Trimethylation | 42.04695 | R |
| Phosphorylation | 79.96633 | S, T, Y |
