| 1. | The distinct peripheral belt demonstrates that a conchiolin keel was present.
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| 2. | Both genera are characterised by partially uncalcified ( conchiolin ) shell portions.
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| 3. | Conchiolin is composed largely of quinone-tanned proteins.
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| 4. | There are no visible growth lines of conchiolin in cross-sections of sclerites.
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| 5. | The combination of aragonite and conchiolin is called nacre, which makes up mother-of-pearl.
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| 6. | On the teleoconch whorls, the peripheral belt on which the conchiolin keel was attached is very clear.
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| 7. | In the mantle, tiny tubes excrete the almost invisible specks of mineral salt that cement to the conchiolin.
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| 8. | The layers usually incorporate a substance called conchiolin, often in order to help bind the calcium carbonate crystals together.
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| 9. | These semi-rigid structures are part of the periostracum, a thin protein layer ( conchiolin ) secreted by the snail to cover the calcareous shell.
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| 10. | It is also possible to test conchiolin, which is an organic protein found in shell, but this only constitutes 1-2 % of shell material.
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