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Studies have been conducted on eight sets of monozygous and nine sets of dizygous female Negro twins, both members of whom were heterozygous for G-6-PD deficiency. Twins were studied both by assay of erythrocytic G-6-PD activity and by the methemoglobin elution test (MET). The MET is a procedure which identifies histochemically cells with appreciable G-6-PD activity and permits accurate determination of the percentage of such cells in heterozygotes. Monozygous twins showed significantly less “within-pair” variation than dizygous twins with both the MET and G-6-PD assay

Inheritance of quantitative expression of erythrocyte glucose-6-phosphate dehydrogenase activity in the Negro?a twin study