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An autoradiogram of FMR1 PCR products. Lanes 1, 4, 5, 9, 10, 13, 14, 16, and 19: normal homozygous woman; lanes 2, 6, 7, 8, 11, 12, and 17: normal heterozygous woman; Lanes 15 and 18: woman with normal and full mutation allele; lane 20: full mutation male; lane 3: woman with normal and premutation FMR1 allele; Lane 21: normal homozygous woman with 29 repeats (reference standard). FMR1, fragile X mental retardation gene 1; PCR, polymerase chain reaction.
