WB results showed that the expression levels of collagen IV and fibronectin in renal tissues of the NC group and NK group were very low, and the expression levels of collagen IV and fibronectin in the DM group and DK group were higher than those in the normal group (∗P < 0.05, ∗∗P < 0.01), and the protein expression level of the DK group was the highest (Figure 4(b)). Here, FN1 is linked to diabetes mellitus.