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Schematic representation of mineralized giant network-like skeleton of I. basta marine demosponge (a). The flat construct is made of highly organized intercalated meshes of microfibers with a diameter of 100 µm (b). These fibers are made of nanostructured chitin (c) that plays the role of template for the formation of calcitic nanocrystals (d), which remains well visible using SEM (e).
