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Focused ion beam images of the onset of enamel mineralization in a wild‐type mouse mandibular incisor. The first enamel ribbons form on collagen mineral near the ameloblast membrane and orient along the path that the ameloblast process that initiated them retracted into the distal membrane. Key: Am, ameloblast; arrowheads, mineral in collagen bands; asterisk, enamel protein; d, dentin.
