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. 2023 Mar 6;14:1251. doi: 10.1038/s41467-023-36909-y

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Fig. 4 — a Artificial heart valve, scale bar is 1 cm; b Fish fin structure, scale bar is 1 cm; c Nacre and Bouligand structure, scale bar is 5 mm; d Comparison of fracture toughness, insert are samples after test, green line: nacre; blue line: Bouligand.