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Sagittal section of the skull at day 540 (A) and at day 1080 (D) with a binocular loupe. The line delimits the skull contour, and the arrow points to the tectum space. SEM photograph showing the calcite crystals in (B) and (E). (C) EDXS spectrum of carbonate in (B). (F) EDXS spectrum of minerals in (E).
