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of arthopods, the fibrous ECM of sponges, and the squid beak. Chitin forms into fibers and the fibers are organized into one of three crystalline shapes, α/β/γ. The chitin in arthropods and sponges are mostly in the α shape, organized into sheets (laminae) with the help of β-sheet-rich chitin-binding proteins. The chitin in squid beak is in the β form, organized into a hard composite material with protein coacervates. The cocoon contains γ-chitin.

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