Figure 2. Up-regulated expression of TLR2 and TLR4 in inflamed gingival epithelial tissues. Cryosections of healthy gingival tissues (a,c) and inflamed gingival tissues (b,d) were stained brown with anti-TLR2 antibody (a,b) and anti-TLR4 antibody (c,d). The sections were counterstained blue with hematoxylin (a–d). Scale bars: 20 µm.