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We report the case of an African American woman with sickle cell anemia and iron overload incompletely explained by erythrocyte transfusion who is heterozygous for a promoter mutation in the X-linked erythroid-specific 5-aminolevulinate synthase gene (ALAS2): a C to G transversion at nucleotide −206 from the transcription start site, as defined by primer extension (−258 from the start ATG). This mutation...
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