Fig. 2: Creation of PTMAtlas and comparison with other PTM databases.

a, Distribution of collected PTM-enriched MS/MS datasets and the identified PTM sites across the six PTM types. b, Rarefaction curve analysis for the six PTM types. c, Comparison of phosphorylation sites identified in PTMAtlas and PXD012174. d, Comparison of the count distribution of supporting PSMs for all phosphorylation sites identified in PXD012174, all phosphorylation sites identified in PTMAtlas and phosphorylation sites identified in PTMAtlas but not PXD012174. e–j, Comparison of PTMAtlas and other databases in terms of the number of identified PTM sites and associated proteins across six PTM types.