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Fragile X [fra (X)] syndrome is a frequently encountered form of mental retardation and is inherited as an X-linked semi-dominant trait with reduced penetrance. We report here the characterization of a highly polymorphic dinucleotide repeat, DXS 548, which is approximately 150 kb proximal to the fra(X) site and the associated FMR-1 gene. DXS 548 is tightly(More)
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