The mRNA levels of Arg1 (Figure 4I) in macrophages from KO-T2D hearts were decreased when compared to WT- T2D groups, while the levels of other anti-inflammatory genes, including Mrc1, Clec10a, and Retnla, were comparable in macrophages from WT- T2D and KO-T2D hearts (Figures 4J–L). Here, MRC1 is linked to type 2 diabetes mellitus.