REG1A and diabetes mellitus: CDH1 (DN Micro vs. DM p < 0.0001, DN Micro vs. NP p < 0.0003), as well as REG1A (DN Micro vs. DM p < 0.05 DN Micro vs. NP p < 0.01), could be confirmed as differentiation markers between DN Micro and other groups (Figure 1B).