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Table 2 Redundancy of PPIs.

From: Protein-protein interaction databases: keeping up with growing interactomes

Species Proteins Interactions >1 publication >1 method >1 database
C. elegans 3,173 5,300 668 (13%) 155 (3%) 4,536 (86%)
D. melanogaster 7,529 24,811 198 (1%) 298 (1%) 17,904 (72%)
H. sapiens 10,397 51,308 9,358 (18%) 21,036 (41%) 26,263 (51%)
S. cerevisiae 5,806 69,059 12,037 (17%) 17,219 (25%) 29,053 (42%)
  1. The total number of proteins and interactions (that could be mapped to Ensembl gene identifiers), as well as the number of interactions reported by more than one publication, more than one method or more than one database, is shown. Relative numbers were obtained through normalisation with the total number of interactions.