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. 2022 Jan 4;24:1. doi: 10.1186/s13058-021-01497-6

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© The Author(s) 2021

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. 4 — miR-550a-5p promotes proliferation, migration and invasion of breast cancer cells. A miR-550a-5p expression in three breast cancer cell lines was detected by qRT-PCR. B, C, The proliferation viability and colony formation ability of MDA-MB-231 cells transfected with miR-550a-5p mimics or miR-NC were evaluated by CCK-8 assay and colony formation assay. D–F The migration and invasion abilities of MDA-MB-231 cells transfected with miR-550a-5p mimics or miR-NC were evaluated by wound healing assay, transwell migration and invasion assay. G, H The proliferation viability and colony formation ability of MCF-7 cells transfected with miR-550a-5p inhibitor or inhibitor-NC were evaluated by CCK-8 assay and colony formation assay. I–K The migration and invasion abilities of MCF-7 cells transfected with miR-550a-5p inhibitor or inhibitor-NC were evaluated by wound healing assay, transwell migration and invasion assay. *P < 0.05, **P < 0.01