Table 1.

Data features

Data type	No. of genes	Data source
Literature	26 475	Entrez gene
Functional annotation	14 667	Ashburner et al. (2000)
	16 015
	16 507
Protein domain	15 565	Ng et al. (2003)
Protein–protein interaction and genetic interaction	8787	Entrez Gene
	2166	Vastrik et al. (2007)
	6982	Gary et al. (2003)
	9295	Keshava Prasad et al. (2009)
	6279	Shannon et al. (2003)
Gene context	11 303	Bowers et al. (2004)
Protein phosphorylation	5490	Linding et al. (2008)
Gene expression profile	19 777	Obayashi et al. (2008)
Transcription regulation	937	Ferretti et al. (2007)