Table 2. Relevance of P2X1–4 subunits staining with four types of I_ATPs.

	P2X1	P2X2	P2X3	P2X4
Fast	+ (5)	+ (6)	+ (8)	+ (4)
Intermediate	+ (4)	− (3)	+ (5)	+ (5)
Slow	+ (4)	+ (4)	+ (3)	+ (5)/− (3)
Very Slow	− (5)	+ (3)	+ (4)	− (4)

+ stands for positive staining, − stands for negative staining.