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. 2019 Jan 15;9:145. doi: 10.1038/s41598-018-35949-5

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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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Potency of complex mixtures of air pollutants. (a) linear regressions of heart rate responses for RO (green), CDEP (silver), B0 (black), B50 (dark blue), and B100 (light blue). (b) Comparison of slopes, which were used as an indicator of the relative potency of the extracts (mean ± SEM). Slope values can be read as Δbpm/µg extractable organic matter/ml. (*p < 0.05, ***p < 0.001). One-way, two-tailed ANOVA and Tukey’s.