Fig. 1From: Effect of ACE, ACE2 and CYP11B2 gene polymorphisms and noise on essential hypertension among steelworkers in China: a case–control studyAgarose gel (2%) electrophoresis of ACE I/D. (1) DD(190 bp); (2) ID(190 bp + 490 bp); (3) II(490 bp); 4: DNA markerBack to article page