From: A graph-based approach for proteoform identification and quantification using top-down homogeneous multiplexed tandem mass spectra
PTM
Monoisotopic mass (Da)
Amino acids
Acetylation
42.01056
R, K
Methylation
14.01565
Dimethylation
28.03130
Trimethylation
42.04695
R
Phosphorylation
79.96633
S, T, Y