Hematoxylin‐eosin (H&E) and Oil Red O staining of aortic root sections further confirmed that the severity of atherosclerosis was significantly lower in GRK2ECKO; ApoE‐/‐ mice than in GRK2flox/flox; ApoE‐/‐ mice (Figure 3g–i). The gene discussed is APOE; the disease is atherosclerosis.