An Arab family with three homozygotes for βδ-thalassemia is described. The single hemoglobin present in their red cells is fetal hemoglobin. A mild hemolytic condition was seen in the propositus, while the two other siblings are completely normal. The main differential diagnosis of this condition is homozygosity for persistent fetal hemoglobin gene.
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Ramot et al. (1970) studied this question.
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