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. 2022 Feb 16;9:rbac010. doi: 10.1093/rb/rbac010

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© The Author(s) 2022. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 4. — Photograph images of materials after dye penetration assay. Perspective views of (A) CO₃Ap-30 and (B) CO₃Ap-15. Cross-sectional views of (C) CO₃Ap-30 and (D) CO₃Ap-15.