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Allan Herndon Syndrome
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An inherited disorder that may be characterized by severe mental retardation, an impaired ability to form words and speak clearly, diminished muscle tone, and/or movement abnormalities.

NORD: Allan Herndon Syndrome
Definition of the syndrome from the National Organization for Rare Disorders (U.S.).

Orphanet: Allan-Herndon-Dudley Syndrome
Brief information from Orphanet (France).

Allan-Herdonin oireyhtymä
Information from the Finnish Information Center on Mental Retardation.

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