What are Hunter-Schreger bands characterized as?

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Alternating dark and light enamel bands visible in a longitudinal ground sectionAlternating dark and light enamel bands observed in a horizontal ground sectionAlternating dark and light dentin bands seen in a longitudinal sectionAlternating dark and light dentin bands visible in a horizontal section

Explanation

Hunter-Schreger bands are alternating dark and light bands found in the enamel when viewed in a longitudinal ground section. They are not features of dentin or visible in horizontal sections.