Produces peripheral paralysis by blocking neuromuscular transmission at the postsynaptic site. Very weak inhibitor of the endogenous nicotinic acetylcholine receptors (nAChR) in the human rhabdomyosarcoma TE 671 cell line. This neurotoxin is lethal to zebrafish by injection at the back of the dorsolateral region, but is not toxic to mice by intraperitoneal injection. Expressed by the venom gland. Belongs to the snake three-finger toxin family. Ancestral subfamily.