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Hundreds of soluble and insoluble proteins control shell formation. They are secreted into the extrapallial space by the mantle, which also secretes the glycoproteins, proteoglycans, polysaccharides and chitin that make up the organic shell matrix. Insoluble proteins tend to be thought of as playing a more important/major role in crystallization control. The organic matrix of shells tends to consist of ?-chitin and silk fibroin. Perlucin encourages carbonate deposition, and is found at the interface of the

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