CD4 and type 1 diabetes mellitus: Assessment of the CD4+ TCR Vβ repertoire was performed in two ways: a) Vβ repertoire of each T1DM patient was compared with the Vβ mean values of the control group and b) statistical analysis was performed, in order to detect the presence of CD4 + Vβ lymphocyte clones in the group of T1DM patients with different quantitative expression in comparison to the control group.