Immunogen sequence: NVTTVDTKRR TETVQKLCPG GQLPFLLYGT EVHTDTNKIE EFLEAVLCPP RYPKLAALNP ESNTAGLDIF AKFSAYIKNS NPALNDNLEK GLLKALKVLD NYLTSPLPEE VDETSAEDEG VSQRKFLDGN ELTLADCNLL PKLHIVQVVC KKYRGFTIPE AFRGVHRYLS NAYAREEFAS TCPDDEEIEL AYEQVAKALK. Chloride chan