Figure 2. Immunohistochemical staining for AhR (A,C,E) and CYP1A1 (B,D,F) in Pn9 rat upper first/second molars. (A,B) Control. Dam exposed to 50 µg/kg TCDD (C,D) and 1000 µg/kg TCDD (E,F). No differences between controls and exposed rats are obvious in either AhR or CYP1A1 staining. AhR reactivity is more intense in ameloblasts than in odontoblasts. a, ameloblasts; d, dentin; e, enamel; o, odontoblasts. Bar: 100 µm in A-F.