in the presence of micromolar concentration of nonhydrolyzable guanosine 5'-triphosphate ( gtp ) analogue 5'-guanylylimidodiphosphate ( gppnhp ) and the absence of mg2+ at the inner surface of patch membrane [ ( mg2+ ] i ) , the channel activity recovered in inside-out patch condition .
C0018353
guanosine
C0018366
guanylylimidodiphosphate