What is Botulinum Toxin? Botulinum A toxin 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. There are seven distinct serotypes of Clostridium botulinum A toxin, named type A through G.Production and Mechanism...