The proportion of NRG4-positive cells in the T2DM+FT group was only 23.09 ± 1.22%, while in the T2DM group it was 55.33 ± 3.32%, and in the Ctrl group it was as high as 80.02 ± 4.02% (Figure 3). The gene discussed is NRG4; the disease is type 2 diabetes mellitus.