IF analysis of co-expression between p-CaMKII α and NeuN in L4-L6 DRGs revealed that relative to controls, the proportion of p-CaMKII α-positive L4-L6 DRG neurons (stained with NeuN) in DNP rats was markedly increased in week 2 and 3 of STZ-induced diabetes (representative IF images: Figs. 3, a, 4, a, and 5, a, analysis: Figs. 3, b, 4, b, and 5, b). Here, CAMK2G is linked to diabetes mellitus.