Which of the following statements about the striae of Retzius is incorrect?

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They represent incremental growth lines within enamel rodsThey contain a high proportion of inorganic materialThey are regions characterized by greater porosityThey facilitate the passage of water and small ionsThey appear as alternating light and dark bands in enamel

Explanation

The striae of Retzius are incremental growth lines within enamel rods (A), characterized by increased porosity (C), and they allow movement of water and small ions (D). However, they do not have a high inorganic content (B), as these areas are relatively more organic and porous compared to the surrounding enamel.