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Gilles de la Tourette's syndrome in monozygotic twins
  1. Jack Waserman*,
  2. Samarthji Lal*,
  3. Serge Gauthier
  1. *Department of Psychiatry, McGill University, Montreal, Quebec, Canada
  2. Department of Neurology,† McGill University, Montreal, Quebec, Canada

    Abstract

    Concordance is reported of Gilles de la Tourette syndrome in a male twin pair in whom phenotyping revealed a >98·7% probability that they were monozygotic. The development and extent of the illness differed markedly in the two subjects. Our findings are compatible with the view that there is a genetic form of Gilles de la Tourette syndrome.

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