Table 1.

Data source of PPIs stored in Dr. PIAS.

Data source	Number of PPIs	Reference
Entrez Gene	57,570	[17]
Ramani et al. (2008)	6,937	[21]
Genome Network Platform	5,528	[18]
Stelzl et al. (2005)	3,164	[19]
Lim et al. (2006)	2,296	[20]
Total number of non-redundant PPIs	71,500