Localization of NUMB in odontogenic tissues at postnatal day 7: NUMB expression is more defined in the immature ameloblasts, and very low expression levels can be detected in the immature odontoblasts. Scale bar represents 50 μm for (a), 100 μm for (b), and 50 and 20 μm for (a1), (b1), and (b2), respectively.
