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SysPTM content and statistics. A, SysPTM road map, with overview of database construction and online tools. B, number of unique proteins and unique PTM sites stored in SysPTM, in total and for seven common modification types. C, distribution of PTM site number: 59% of proteins have more than one modification site. D, distribution of PTM type number: 13% of proteins have more than one modification type.
