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Polymerase chain reaction of the GSTT1 and GSTM1 genes. Lanes M: molecular weight maker; Lanes 1 and 4: patients homozygously null for GSTT1; Lanes 2, 3, 8 and 9: patients with positive GSTT1 and GSTM1 genotypes; Lanes 5 and 6: patients homozygously null for GSTM1; Lane 7: patient homozygously null for GSTT1and GSTM1; Lane 10 negative control.
