Binds at site 4 of sodium channels (Nav) and inhibits the fast inactivation of cockroach channels. This toxin is active only on insects (By similarity) Has a potent activity against S.litura larvae. Expressed by the venom gland. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. Belongs to the neurotoxin 07 (Beta/delta-agtx) family. 01 (aga-2) subfamily.