Reptile-specific three-finger toxin that is lethal at low doses for lizards, but not for mice. Probably acts as a neurotoxin. Monomer. Expressed by the venom gland. The N-terminus is blocked. Contains 5 disulfide bonds. LD(50) is 0.28 ug/g by intraperitoneal injection in A.carolinensis and 0.6 ug/g in H.frenatus. Not toxic to neonate mice by intraperitoneal injection at doses up to 5 ug/g. Belongs to the snake three-finger toxin family. Ancestral subfamily. Boigatoxin sub-subfamily.