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botulinum toxin

/ˌbɒtjʊˈlaɪnəm/
noun
1.
a pharmaceutical formulation of botulin used in minute doses to treat various forms of muscle spasm and for the cosmetic removal of wrinkles See Botox
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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botulinum toxin in Science
botulinum toxin
  (bŏch'ə-lī'nəm)   
Any of several enzymes produced by the bacterium Clostridium botulinum that are extremely potent neurotoxins. Botulinum toxin interferes with the ability of neurons to release acetylcholine at nerve-muscle junctures, thereby inducing the paralysis of botulism. Botulinum toxin is resistant to enzymatic digestion in the body and is used as an antispasmodic and a treatment for wrinkles by paralyzing facial muscles. Also called botulin.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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