the reconstituted k+ channel is activated by ca2+ in the physiological range of concentration ( k1/2 approximately 2 x 10 ( -7 ) m at ph 7.2 ) as found for the k+ channel in native plasma membrane vesicles and shows the same sensitivity to inhibitors ( ba2+ , trifluoperazine , calmidazolium , quinidine ) and to protons .
C1721009
k1
C0007603
plasma membrane