Toxin that specifically inhibits tetrodotoxin-sensitive voltage-gated sodium channels (Nav) (IC(50) of =about 9 nM). In vivo, insects injected with this toxin showed signs of neurotoxicity including twitching, paralysis, and body contraction. Expressed by the venom gland. Contains 2 disulfide bonds. The LD(50) ranges from 0.25 mg/kg in adult blowflies to 23.7 mg/kg in cockroaches;. Belongs to the scoloptoxin-03 family.