Sodium channel (Nav) specific neurotoxin. Causes impairment of movement and mild paralysis in crickets at a dose of 0.5 ug per animal. A dose of 0.8 ug per cricket causes clear flaccid paralysis. A dose of 1.0 ug per cricket causes death within 2 hours. Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to antiparallel beta-sheets by disulfide bonds (CS-alpha/beta). Non-toxic to mice at a dose of 100 ug per 20 g mouse weight. Belongs to the long (4 C-C) scorpion toxin superfamily. Sodium channel inhibitor family.