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. 2020 May 25;20:470. doi: 10.1186/s12885-020-06885-3

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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. 4 — Activity of CB-839 in 3D spheroid versus 2D monolayer cell cultures. Images of MDA-MB-231 (a), SUM159PT (b) and Hs578T (c) 3D spheroid cell cultures captured on day 4 and 8 (scale bar = 0.5 mm). Thymidine incorporation in MDA-MB-231 (d), SUM159PT (e) and Hs578T (f) 3D spheroid cultures and 2D monolayer cultures following 4 days treatment with CB-839 (mean ± SEM, n = 4–6)