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Multiplex polymerase chain reaction analysis of glutathione S-transferase M1 (GSTM1) and glutathione S-transferase T1 (GSTT1) polymorphisms. Lane 1 – GSTM1 non-null/GSTT1 non-null. Lane 2 – GSTM1 non-null/GSTT1 null. Lane 3 – GSTM1 null/GSTT1 non-null. Lane 4 – GSTM1 null/GSTT1 null genotype. Lane 5 – 100 bp ladder (#N3231S, New England Biolabs, Ipswitch, USA).
