CD4 and type 1 diabetes mellitus: The percentage of CD4 Tcm lymphocytes was lower in both the 18q del and the T1DM group than in the healthy controls, p = 0.0289, and p = 0.0019, respectively, but there was no difference in the percentage of CD4 Tcm lymphocytes between the 18q del and the T1DM group, p = 0.548 (Figure 2E).