Similar results were observed as well in several studies examining the retinas of individuals with diabetes [37, 80]; altered expression of some proteins was reported to be linked with retinal neurodegeneration in diabetics, such as somatostatin (SST), apolipoprotein A1, fibrinogen A, pigment epithelial derived factor (PEDF), interphotoreceptor retinol binding protein (IRBP) [81, 82]. Here, SST is linked to diabetes mellitus.