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. 2019 Feb 11;10(2):124. doi: 10.1038/s41419-019-1333-7

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© The Author(s) 2019

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 7 — a Dose−response curve of LanthaScreen^TM Eu kinase binding assay demonstrated a dose-dependent decrease in emission ratios induced by luteolin, quercetin or myricetin. Luteolin, quercetin or myricetin inhibited ALK5 activity with IC₅₀ values of 1.062, 1.480, and 4.083 μM, respectively. b In vitro phosphorylation of GST-Smad3 by ALK5 was significantly reduced by luteolin, quercetin or myricetin. Data are the mean ± SD (three independent experiments)