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Focused ion beam images of Amelx ‐/‐ Level 6 enamel. Arrowheads point to the DEJ. The enamel development at Level 6 is in late maturation stage. X‐ray diffraction at this stage showed the mineral to be octacalcium phosphate, not hydroxyapatite. The enamel layer surface is rough and ~20 μm thick. Key: Am, ameloblast; d, dentin; e, enamel.
