A poisonous neurotoxic protein produced under low-oxygen conditions by Clostridium botulinum, a gram-positive anaerobic bacterium. Botulism toxin is divided into seven distinct yet structurally similar neurotoxins. It blocks nerve functions and can result in muscular and respiratory paralysis. It is also used as medication for managing conditions like strabismus, hemifacial spasm, focal dystonia, and more.