Assertion: aragonite's structure | /r/MadeOf | fibrils of a chitin
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Source sentences:
text: While the intertabular membranes have no defined structure and seemingly consist only of organic material trapped between platelets, the interlamellar membranes have a felt-like structure (Figures 7C,E), consisting of fibrils of a chitin (most probably β-chitin) + protein complex, surrounded by proteins (Levi-Kalisman et al., 2001; Osuna-Mascaró et al., 2015).