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botulinum toxin
Botulinum toxin (BTX) is a neurotoxic protein produced by the bacterium ''Clostridium botulinum'' and related species. It is also produced commercially for medical, cosmetic, and research use. There are two main commercial types: botulinum toxin type A and botulinum toxin type B.
Infection with the bacterium may result in a potentially fatal disease called botulism. Botulinum is the most acutely lethal toxin known, with an estimated human median lethal dose (LD50) of 1.3–2.1 ng/kg intravenously or intramuscularly and 10–13 ng/kg when inhaled.
Botulinum toxin type A and B is used in medicine for, among others, upper motor neuron syndrome, focal hyperhidrosis, blepharospasm, strabismus, chronic migraine and bruxism. It is also widely used in cosmetic treatments. The U.S. Food and Drug Administration requires a boxed warning stating that when locally administered the toxin may spread from the injection site to other areas of the body, causing symptoms similar to those of botulism. The warning was the result of deaths associated with its uses.〔〔 The commercial form is marketed under the brand name Botox, among others. Botox is made by Allergan.
==Uses==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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