Figure 1. Expression of TLR2, TLR4, NOD1, and NOD2 in human gingival epithelial tissues. Cryosections of healthy gingival tissues (a,c,e,g) and inflamed gingival tissues (b,d,f,h) were stained brown with anti-NOD1 antibody (a,b), anti-NOD2 antibody (c,d), anti-TLR2 antibody (e,f), and anti-TLR4 antibody (g,h). The sections were counterstained blue with hematoxylin (a–h). Scale bars: 100 µm.