Taipoxin

Taipoxin is an extremely potent neurotoxin developed by purifying the venom of the Australian taipan Oxyuranus microlepidotus. The toxin causes a gradual reduction to complete stop of evoked and spontaneous release of acetylcholine from motor nerve terminals. The victim dies from asphyxia caused by paralysis of the respiratory muscles. It is the most lethal neurotoxin isolated from any snake venom so far.

The molecular mass is about 46,000 Dalton; median lethal dose for mice was determined as 2 μg/kg (subcutaneous injection).