CXCL16 and type 2 diabetes mellitus: Supplementary Figure 3 shows that there was no significant difference of the mean levels of ANG-1, CXCL16, PDGF-BB, TIMP-1, TIMP-2, and VEGFR2 in the NPDR and T2DM groups (322.83 vs. 315.24 ng/mL, 3,796.44 vs. 3,889.65 pg/mL, 32.17 vs. 30.74 pg/mL, 6.70 vs. 6.77 ng/mL, 107.13 vs 112.94 ng/mL, and 12.99 vs. 12.99 ng/mL, respectively).