neurotoxin

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

a neurotoxin (trade name Botox) that is used clinically in small quantities to treat strabismus and facial spasms and other neurological disorders characterized by abnormal muscle contractions; is also used by cosmetic surgeons to smooth frown lines temporarily