Binds and inhibits fetal (alpha-1-beta-1-gamma-delta/CHRNA1-CHRNB1-CHRNG-CHRND, IC(50)=1.4 nM), adult (alpha-1-beta-1-delta-epsilon/CHRNA1-CHRNB1-CHRND-CHRNE, IC(50)=12 nM) and neuronal alpha-7/CHRNA7 (IC(50)=400 nM) nicotinic acetylcholine receptors (nAChR) thereby impairing neuromuscular and neuronal transmissions. Expressed by the venom gland. LD(50) is 63.5 ug/kg by intravenous injection into mice (1.27 ug/mouse). Belongs to the snake three-finger toxin family. Short-chain subfamily. Type I alpha-neurotoxin sub-subfamily.