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). This evidence concerns the gene CD40LG and Behcet disease.