Inhibitor of voltage-gated potassium channels. Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to antiparallel beta-sheets by disulfide bonds (CS-alpha/beta). Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 02 subfamily. According to mail exchange with L.D. Possani, the recommended name of this toxin has been updated to alpha-KTx 2.19, since alpha-KTx 2.15 is already used for Toxin II.10.5 (AC C0HJW1).