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SEM images of enamel surfaces from WT, KI, and HET mandibular incisors. WT incisors exhibit a smooth enamel surface (A), whereas KI incisor surfaces are characterized by a rough enamel surface comprised of numerous spherical nodules (B). Examples of enamel surfaces of HET incisors show that HET enamel exhibits a wide range of phenotypes with few to no surface defects (C), as in WT enamel, to surfaces that are highly defective and remarkably similar to those of KI enamel (D).
