a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species

any of several neurotoxins that are produced by the anaerobic bacterium Clostridium botulinum; causes muscle paralysis

a neurotoxin that is deadly for humans; found in various marine algae

a powerful neurotoxin produced by certain dinoflagellates found in red tides; it can accumulate in mollusks that feed on the dinoflagellates and cause food poisoning to humans

a potent neurotoxin found in a particular frog

a powerful neurotoxin found in the ovaries of pufferfish