Table 3.

K_i values for NTPDase1, 2 and 3 obtained for reactive blue 2, PPADS, suramin, and ARL67156, using the in-capillary electrophoresis method.

Inhibitora	Ki ± SEM [μM]
	NTPDase1	NTPDase2	NTPDase3
RB2	20.0 ± 0.003	24.2 ± 0.06	1.10 ± 0.03
PPADS	46.0 ± 0.01	44.2 ± 0.03	3.0 ± 0.001
Suramin	300 ± 0.1	65.4 ± 0.01	12.7 ± 0.03
ARL 67156	27.0 ± 0.004	Q 1000b	112.1 ± 0.05
Dipyridamole	> 1000c	> 1000c	> 1000c

The results are means T SEM of three separate experiments each run in duplicate.

^a For structures see Figure 1.

^b50% inhibition at 1 mM concentration.

^cNo inhibitory activity up to a concentration of 1 mM.