Insecticidal toxin. Causes flaccid paralysis followed by death when injected into Heliothis virescens larvae. Does not induce any toxic effects when injected intravenously into adult mice at a dose of 1.25 mg/kg body weight. Expressed by the venom gland. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. LD(50) is 7 mg/kg on H.virescens larvae. Belongs to the neurotoxin 16 (SFI) family. Mass spectrometry experiment was done on the entire protein whose known sequence is incomplete (sequence of 1-18). The difference between measured (4993) and calculated (5136) mass resides in the fact that the sequence of this entire protein is maybe not identical to the sequence shown.