Figure 2. Immunohistochemical detection of N-acetyltransferases NAT1 (left column, A-C-E) and NAT2 (right column, B-D-F) in inflamed (top, A + B) or normal (middle, B + C) gingival tissue, control with pre-immune serum (bottom, E + F). Arrows indicate endothelial cells; bars represent 50 µm.