Table 1.

Current densities (I) of P2X7 receptors

	24 hours				48 hours
	0 nM	2 nM	20 nM	200 nM	0 nM	2 nM	20 nM	200 nM
I (pA/pF)	3.41 ± 0.62	3.19 ± 0.34	2.59 ± 0.19	2.25 ± 0.30*	2.25 ± 0.32‖	2.95 ± 0.24†	4.56 ± 0.56‡¶	1.26 ± 0.16§

*P_{200 vs. 0 nM, 24 h} < 0.05. ^†P_{2 vs. 0 nM, 48 h} < 0.05. ^‡P_{20 vs. 0 nM, 48 h} < 0.01. ^§P_{200 vs. 0 nM, 48 h} < 0.05. ^¶P_{20 vs. 2 nM, 48 h} < 0.05. ^‖P_{0 nM, 48 vs. 24 h} < 0.05