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. 2020 Oct 31;21:287. doi: 10.1186/s12931-020-01518-6

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© The Author(s) 2020

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. 1 — CXCR7 and CXCR4 expression in lung tumor tissue. a. Lung tumor samples were subjected to immunohistochemical staining for CXCR7(upper) and CXCR4(lower) expression, para-tumor tissue as normal control (n = 4) (Magnification: 200×). b. Lung tumor tissue and para-tumor tissue were lysed and analyzed for CXCR7 and CXCR4 expression by western blot. β-actin was used as a loading control (n = 2)