CD8A and Behcet disease: Percentages of CD8+CD40L+ T cells (a) and CD40L+ monocytes (b) were determined under basal conditions and after 3-h stimulation with 1.5 μM ionomycin and/or 25 ng/ml PMA by flow cytometry in healthy control subjects (HC), patients with inactive Behçet’s disease (iBD), and patients with active Behçet’s disease (aBD).