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A neurotoxin is a toxin that acts specifically on nerve cells[1] (neurons), usually by interacting with membrane proteins such as ion channels. Some sources are more general, and define the effect of neurotoxins as occurring at nerve tissue.[2] Bungarotoxin, which is considered a neurotoxin,[3] has its effect at the motor end plate. Many of the venoms and other toxins that organisms use in defense against vertebrates are neurotoxins. A common effect is paralysis, which sets in very rapidly. The venom of bees, scorpions, pufferfish, spiders and snakes can contain many different toxins. Many neurotoxins act by affecting voltage-dependent ion channels
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