Medical Definition of apamin
: a neurotoxic polypeptide C79H131N31O24S4 in the venom of the honeybee (Apis mellifera) that is used especially in biomedical research Apamin is a potent bee venom toxin that blocks small calcium-activated potassium channels. This toxin is also the bee venom constituent responsible for the painful sensation that accompanies bee stings.— David Gurwitz, The Lancet, 23 Jan. 1999
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