Figure 1. Amplification product of the 27-bp insertional variable number of tandem repeat polymorphism in intron 4 of eNOS. The amplified products were separated by electrophoresis on 4% agarose gel. Lane L, 100-bp DNA ladder; lane NC, negative control (no template DNA); lane PC, positive control; lane 1, 2 and 5, homozygous eNOSb/b genotype (420 bp fragment); lane 3, heterozygous, eNOSa/b genotype (420-bp and 393-bp fragments); and lane 4, homozygous a/a genotype (393-bp fragment).