Last, in a recent study, short‐hairpin RNA (shRNA) of angiotensin converting enzyme was injected into rat myocardium postmyocardial infarction using a dextran‐poly(e‐caprolactone)‐2‐hydroxylethylmethacrylate‐poly(N‐isopropylacrylamide) (Dex‐PCL‐HEMA/PNIPAAm) hydrogel, Figure 6d.129 This study used the RNA interference gene‐technique in order to silence the gene responsible for upregulation of angiotensin converting enzyme (ACE). The gene discussed is ACE; the disease is infarction.