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. 2022 Jul 5;18:260. doi: 10.1186/s12917-022-03347-9

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 7 — Histological assessment of critical-sized bone defect repair in rabbit femurs. (A) and (B) femoral condyle sections stained with Hematoxylin and Eosin from the control and UiO-66 implanted groups at weeks 4, 8, and 12 after surgery. (C) PAS & Hematoxylin- stained bone defect sites in control (a-c) and UiO-66 implanted (d-f) groups at different evaluation times. MSC: mesenchymal stem cell; Ob: osteoblast; Oc: osteocyte; Ocl: osteoclast; Og: osteogenic cells; Os: osteoid tissue; BM: bone matrix; SB: spongy bone; WB: woven bone; LB: lamellar bone; M: macrophage; L: lymphocyte; black asterisks: implanted UiO-66 nanomaterial; red arrows: newly formed bone. The scale bars in (A) = 1 mm, (B a-c,g-i) = 100 μm, and in (B d-f, j-l) and (C) = 50 μm