IFNγ levels in supernatants of PBMC from patients with active or inactive Behçet's disease (A-BD, I-BD), from patients with Crohn's disease and coeliac disease (CD), and from normal controls (NC) cultured in the presence of (A) PHA or of increasing amounts of (B) ß-lactoglobulin (ßLG), (C) ß-casein (ßC), and (D) chicken egg albumin (OA).