CCL2 and diabetes mellitus: Gene expression levels of multiple typical inflammatory cytokines confirmed that, after 8 weeks of diabetes, the NTN4KO retinas had an overall higher mRNA expression of Icam1 (Figure 2E), Ccl2 (Figure 2F), and Il6 (Figure 2G) compared to non-diabetic NTN4KO, and also when compared to their diabetic NTN4WT counterparts in the case of Ccl2 (Figure 2F), Il6 (Figure 2G) and Il1b (Figure 2H) expression.