potassium channel KCNO1 KCNO1 potassium channel subfamily K member 1 inward rectifying potassium channel protein TWIK-1 potassium inwardly-rectifying channel, subfamily K, member 1 TWIK1 tandem of P domains in a weak inward rectifying K+ channel 1 potassium channel, two pore domain subfamily K, member 1 K2P1 K2p1.1 HOHO DPK potassium channel K2P1 TWIK-1