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Pathology
A pregnant woman with a family history of fragile X syndrome undergoes prenatal testing of her fetus. PCR analysis to amplify the appropriate region of the FMR1 gene is attempted using DNA from amniotic fluid cells, but no amplified products are obtained. Which of the following is the most appropriate next step?
Routine karyotyping of the amniotic fluid cells
Routine karyotyping of the unaffected father
Southern blot analysis of DNA from the amniotic fluid cells
PCR analysis of the mother's FMR1 gene
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