Table 1. PPI data sources integrated in HIPPIE.

PPI dataset	Reference	Size
HPRD	[6]	40110
BioGRID	[4]	30027
IntAct	[7]	28073
MINT	[8]	14094
Rual05	[19]	6946
Lim06	[17]	5579
Bell09	[13]	3300
Stelzl05	[20]	3232
DIP	[5]	1618
BIND	[11]	1415
Colland04	[21]	882
Lehner04	[16]	385
Albers05	[12]	290
MIPS	[10]	252
Venkatesan09	[22]	239
Kaltenbach07	[15]	227
Nakayama02	[18]	84
HIPPIE		72916