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Document Type

Article

Abstract

The GSTM1 and GSTT1 null genotype frequencies were significantly di1ferent between 658 nonblack and black healthy blood donors from a BraziJian mixed population (Rio de Janeiro). The GSTMI phenotype distribution was not in Hardy-Weinberg equilibrium in either group, mainly because of an excess of the GSTM1 *A/*B genotype.

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