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This article includes supplementary video clips, available online at http://www.interscience.wiley.com/jpages/0885-3185/suppmat .

FilenameFormatSizeDescription
mds21488-MDS21488.mpg13196KSegment 1.Dystonic downward deviation of the left labial angle is shown. The maxillary splint is shown. Dystonia subsides when the patient puts the splint on. Needle electromyography shows spontaneous firing of motor unit action potentials (MUAPs), some of them polyphasic, from left depressor anguli oris (or triangularis) muscle, but not from right depressor anguli oris or left orbicularis oris. When the patient wears the splint, the spontaneous firing of MUAPs subsides and disappears.

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