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The shells of the Pacific oyster Crassostrea gigas contain calcite crystals with three types of microstructures prismatic, chalky, and foliated layers. Many shell matrix proteins were annotated from the shells of C. gigas; however, it is unclear which SMPs play important roles in their shell mineralization. The matrix proteins have never been reported from the chalky layer. In this study, we identified a chalky layer-derived EGF-like domain-containing protein (CgELC) from the chalky layer of C. gigas shells. The gene sequence of the CgELC was encoded under