Botulinum toxin causes paralisis of the cranial ( facial) nerves when a person or animal is sickined with botulism. With this in mind doctors begain using very dilute solutions of the toxin to ';relax'; muscles for cosmetic reasons.
And for extra credit:
http://www.aad.org/public/Publications/p鈥?/a>
http://www.botox.com
http://www.plasticsurgery.org/public_edu鈥?/a>
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