A study, examining the expressions of CCL2 and CCR2 in the plasma, found that in 80 STEMI (ST-Elevation Myocardial Infarction) patients with platelet high response, patients had higher expressions of CCL2 or CCR2 than those patients with a platelet normal response. The gene discussed is CCL2; the disease is ST Elevation Myocardial Infarction.