IHC staining of Fth in odontoblasts of rat maxillary third molar. Sagittal section of a 4-week old rat maxillary third molar stained with anti-Fth antibody and counterstained with hematoxylin. Panel A: the third molar observed under stereoscope with magnification 40x. Panels B1 - B6: Odontoblasts corresponding to indicated regions 1 - 6 identified in panel A are shown with 630x magnification. Ameloblasts (am), enamel (en), dentin (de), and odontoblasts (od) are labeled in panels A and B1. Scale bars: A, 1 mm; B1-B6, 10 μm.