Induces flaccid paralysis when injected into lepidopteran larvae. Intracranial injection into mice causes awkwardness of movement and laboured respiration until death. Expressed by the venom gland. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. LD(50) is 3.1 nmol/kg in lepidopteran larvae. LD(50) is 0.74 pmol/g by intracranial injection into mice. When expressed in tobacco plants, the toxin induces a significant resistance to the insect S.frugiperda. Belongs to the rTX family.