IHC staining of Fth in odontoblasts of rat maxillary incisor. Sagittal section of 4-week old rat maxillary incisor was stained with anti-Fth antibody and counterstained with hematoxylin. Panel A: Whole incisor observed under stereoscope with 12.5x magnification. Panels B1 - B6: Boxed regions (1 - 6) identified in panel A, spanning from outer enamel epithelia to odontoblasts, are shown with 100x magnification. Panels C1 - C6: Odontoblasts corresponding to the indicated regions 1 - 6 in panel A are shown with 630x magnification. Papillary layer cells (pl), ameloblasts (am), enamel (en), dentin (de), and odontoblasts (od) are labeled in panels B3 and C3. Scale bars: A, 1 mm; B1- B6 and C1- C6, 10 μm.