A: number of nodes
  IntAct BioGrid Reactome
IntAct 8,419 5,348 1,248
BioGrid   8,988 1,925
Reactome     4,458
B: number of edges
  IntAct BioGrid Reactome
IntAct 35,634 13,928 2,258
BioGrid   41,496 3,987
Reactome     91,002
Number of unique gene identifiers (A: number of nodes) and interactions (B: number of edges), as well as pair-wise overlap, for the data sources used for retrieving interaction information.
Table 1: Interaction data source overview.