Fig. 2.

Identification and characterization of gastric cancer phosphoproteome. a Number of phosphorylated proteins identified from database search engines Mascot, Sequest, X!Tandem and OMSSA. Unique phosphoproteins identified by overlapping results from the four engines are shown. b Number of non-redundant phosphorylation sites (pS, pT and pY, respectively) for each engine and the total number from all engines are shown. c Venn diagram of 1,211 non-redundant phosphoproteins identified by four database search engines. d Venn diagram of 3,021 non-redundant phosphorylation sites identified by four database search engines. e Summary of gastric cancer phosphoproteome by known annotated and novel phosphorylation sites. Non-redundant phosphorylation sites in gastric cancer cells were compared with Uniprot human database