Figure 2: Overview of the number of data sources available per node (A) and shared by node pairs (B), with a maximum annotation level of five according to the annotation sources (GO process, Reactome pathway membership, PANTHER pathway membership, protein domain, GO molecular function). About 3,000 nodes hold no annotation, about 1,000 nodes hold annotation from all five sources. For about 50 million node pairs the number of shared annotation sources is three out of five.