This toxin blocks the neuromuscular transmission, and also acts on muscle. It exerts an effect of first exciting and then inhibiting the contraction of muscle. This toxin is active only against mammals. Expressed by the venom gland. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. Contains 4 disulfide bonds. LD(50) is 0.772 mg/kg by intraabdominal injection into mice. Belongs to the neurotoxin 35 family.