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. 2019 Nov 15;10:321. doi: 10.1186/s13287-019-1426-3

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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.

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Fig. 6 — Neovascularization was enhanced by CD34⁺-Exos in a rat model of ONFH. a Angiography images. The blood supply of the femoral head in the different groups was measured by micro-fil perfusion. b The quantified result of vessel volume in the different groups. c IHC images showing VEGF staining of the femoral head in the different groups. Scale bar: 200 μm