(A) DNA extraction of control and disease and (B) agarose gel electrophoresis (2%) of GST polymorphism PCR, showing GSTM1 and GSTT1 alleles of healthy control and CAD patients. Extreme right lane contain 100 bp DNA marker, and extreme two left lane contain amplicons of control individual then followed by two lanes of CAD patients and β globin DNA fragment of 300 bp act as an internal standard.