Botulinum toxin (BTX) is a neurotoxic protein produced by the bacterium Clostridium
botulinum and related species. It prevents the release of the neurotransmitter
acetylcholine from axon endings at the neuromuscular junction and thus causes
flaccid paralysis.[2] Infection with the bacterium causes the disease botulism. The
toxin is also used commercially in medicine, cosmetics and research.