CD4 and sarcoidosis: The fraction of FoxP3+ CD4+ T cells in BALF was significantly lower in patients with sarcoidosis compared to other DPLDs and HCs (median (IQR): 3.4% (2.1–4.8) versus 7.1% (4.4–12.6), P = 0.001 and versus 5.3% (4.4–7.0), P = 0.017) (Figure 2(a)).