Causes a slow progressive depressant flaccid paralysis, when injected into S.falculata blowfly larvae. Inhibits dose-dependently the total sodium (Nav) currents both in dorsal root ganglia neurons and in ventricular myocytes. Is toxic to mice by intravenous injection, but not by subcutaneous or intracerebroventricular injection. Produces antiarrhythmia in rat. Is then active on both mammals and insects. Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to antiparallel beta-sheets by disulfide bonds (CS-alpha/beta). LD(50) is 0.8 mg/kg by intravenous injection into mice. Belongs to the long (4 C-C) scorpion toxin superfamily. Sodium channel inhibitor family. PubMed:12230558 uses only BmKIM as the name, whereas the authors submitted sequences using KIM2 as the name.