Of the ATP-sensitive cells, the majority (95.1%, 135/142) responded to ATP with an inward current, a few (2.1%, 3/142) with an outward current, and the rest (2.8%, 4/142) with biphasic current.

• 在对ATP敏感的142个细胞中，绝大部分引起一内向电流（95.；1%25，135/142），少数为外向电流（2