FOXP3 and myeloid sarcoma: At baseline, the mean percentage of CD4+FoxP3+ regulatory T cells (Tregs) in peripheral blood mononuclear cells (PBMCs) were 3.4% (SD = 1.8) in healthy controls (HCs, n = 7) and 2.1% (SD = 0.54) in people with MS (PwMS, n = 6).