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. 2020 Dec 9;20:593. doi: 10.1186/s12935-020-01694-x

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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. 3 — IGF1 was upregulated in BC tissues and cells. a–c IGF1 mRNA and protein levels were detected by qRT-PCR and western blot analyses in BC tissues, adjacent normal tissues, BC cells, and MCF-10A cells. d Overexpression efficiency of IGF1 was determined by western blot assay in BT549 and HCC38 cells transfected with pcDNA3.0-NC or pcDNA3.0-IGF1. ***P < 0.001