Dictionary of Human Evolution and Biology

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Mental Retardation, X-linked Nonspecific

Heritable condition characterized by mental impairment; large testes, ears and jaw; high-pitched voice, and jocular speech. Defective gene also has a fragile site (aka Martin-Bell syndrome). One of tens of sites, many X-linked, that cause mental impairment; the defective gene is an X-linked recessive, MRX. MRX is not the same entity as FRAX, fragile X syndrome.

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