Insecticidal toxin. Lethal to lepidopteran larvae. No adverse affects when intracerebroventricularly injected in mice at a dose of 0.2 ug but causes reversible paralysis of legs when injected intracerebroventricularly in mice at a dose of 2.0 ug. Binds to site 4 of insect voltage-gated sodium channel (Nav) and inhibits channel inactivation. Expressed by the venom gland. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. LD(50) is 24.2 ng/mg body weight of lepidoptera larvae. Belongs to the neurotoxin 07 (Beta/delta-agtx) family. 02 (aga-3) subfamily.