Recombinant toxin that reversibly inhibits the potassium current of mKv1.3/KCNA3 channel stably expressed in COS7 cells (IC(50)=150 nM). 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 26 subfamily.