TABLE 1

Potencies of nucleoside transport inhibitors on human ENTs and PMAT

Values are given as means ± S.D. (n = 3). IC₅₀ values are shown in italics.

Protein	K_i or IC₅₀
Protein	NBMPR	Dipyridamole	Dilazep
	nM
hENT1	0.4 ± 0.1^{^a}	5.0 ± 0.9^{^a}	18.7 ± 2.0^{^b}
hENT2	2800 ± 300^{^a}	356 ± 13^{^a}	134,000 ± 40,000^{^b}
hENT3	>10,000^{^c}	>1000^{^c}	>1000^{^c}
PMAT	11,074 ± 2800	5901 ± 900	10,236 ± 1100

↵a IC₅₀ values from Ward et al. (2000).
↵b K_i values from Visser et al. (2002).
↵c Data from Baldwin et al. (2005).