A. Detection of FadA in subgingival plaque samples by IHC. Three patients with periodontitis are shown here who provided plaque samples from their healthy sites (probing depth ≤ 3 mm, left panels) as well as periodontal diseased sites (probing depth ≥ 7 mm, middle panels). IHC was performed as described using mAb 7H7 at 1:800 dilution. Anti-mouse IgG isotype control of the diseased site is shown (right panels). The images were taken using 100X objective. Scale bar equals 50 μm. 