Figure 3. Analysis of amelotin expression by in situ hybridization. (A) Arrowheads indicate the amelotin signal in ameloblasts of the first (M1), second (M2), and third (M3) molar on post-natal days d5 to d15. Bar indicates 30 µm. (B) Amelotin expression during various stages of amelogenesis in the 10-day-old mouse incisor from the incisal end to the cervical loop. Magnified views (a-i) show details of the restricted expression in maturation-stage ameloblasts. Bar indicates 10 µm.