Table 1. The number of drugs, target proteins, interactions and updated interactions of each type.

	Enzyme	Ion channels	GPCRs	Nuclear receptors
No. of drugs	445	210	223	54
No. of target proteins	664	204	95	26
No. of drug-target interactions (previous)	2,926	1,476	635	90
No. of drug-target interactions (updated)	4,449	2,029	1,268	168