“…13,14 The increased concentration of VEGF in periodontitis may be one of the reasons for the increased vascularization and permeability, and it may be considered as a sign of severe periodontitis. 13,17,18 VEGF is detectable in periodontal tissues within endothelial cells, plasma cells and macrophages, in junctional, sulcular and gingival epithelium, and in GCF. 18 Moreover, VEGF expression may be induced by IL-6, IL-1 and PGE 2 .…”