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Non-specific X linked mental retardation.
  1. B Kerr,
  2. G Turner,
  3. J Mulley,
  4. A Gedeon,
  5. M Partington
  1. Department of Medical Genetics, Prince of Wales Children's Hospital, Randwick, NSW, Australia.

    Abstract

    Non-specific X linked mental retardation (MRX) is mental retardation in persons of normal physical appearance who have no recognisable features apart from a characteristic pedigree. Review of published reports shows that there is clinical variability in the degree of mental retardation within families and genetic heterogeneity, based on gene localisation, between families. We propose a classification based on genetic localisation and a set of minimal clinical features that should be recorded in the hope of identifying possible specific phenotypes.

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