CCR5 and type 1 diabetes mellitus: Notably, Trem2, Cx3cr1, and Ccr5 were highly expressed in M1, M2, M3, and M5 subpopulations (Fig. 3c, e, g) and showed significantly higher expression in the T1D group compared to the Ctrl group, suggesting these genes may play critical roles in T1D pathology (Trem2: p < 0.001; Cx3cr1: p < 0.05; Ccr5: p < 0.001, Fig. 3d, f, h).