CD4 and sarcoidosis: The flow cytometric analysis of the proportion of diverse CD4+ T-cell subsets in the blood of sarcoidosis patients showed that Tregs, Th1, Th17, and Th17.1 cells constituted 7.1% ± 0.7%, 3.0% ± 0.3%, 10.25% ± 0.6%, and 3.15% ± 0.3%, of CD4+ T cells, respectively (Figure 2A).