Figure 1

Detection of polymerase chain reaction (PCR) amplification of GSTT1 (480 bp fragment), β-globin (268-bp fragment) and GSTM1 (215-bp fragment) genes. Absence of the PCR product indicates the null genotype. Ethidium bromide-stained electrophoresed representative PCR products samples: 100 bp ladder (lane L); absence of null genotypes (lanes 3, 4, 9); GSTT1-null allele (lanes 2, 5) and GSTM1-null allele (lanes 1, 2, 5, 6, 7, 8, 10, 11).