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Frequency distribution of STR markers flanking the FMR1 gene. DXS548 (A), FRAXAC1 (B), and FRAXAC2 (C) allele distributions among the unaffected Chinese (n = 566; gray bars), Caucasians (n = 721; white bars), and African Americans (n = 637; black bars) (Crawford et al. 2000a). FMR, fragile X mental retardation 1.
