Figure 4.

Photos of Mouse Dentitions at 7 weeks. A: Frontal views of incisors. The teeth from all three genotypes look very similar, with no signs of enamel chipping. The null mice have black coat hair stuck in the gingival crevice, which relates to the hair phenotype. B: Going clockwise from upper left: lateral, medial, lingual, labial views of the mandibular incisor. C: Occlusal, lingual, and buccal views of the mandibular incisors. All phenotypes show normal crown morphology, smooth, lusterous enamel without evidence of attrition.