. "\"Catalysis of the transmembrane transfer of a potassium ion by an inwardly-rectifying voltage-gated channel, where the inward rectification is due to a voltage-dependent block of the channel pore by ATP. An inwardly rectifying current-voltage relation is one where at any given driving force the inward flow of K+ ions exceeds the outward flow for the opposite driving force.\" [GOC:cb, GOC:mah]" . . "ATP-activated inward rectifier potassium channel activity" . .