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. 2017 Jan 13;18:4. doi: 10.1186/s40360-016-0110-9

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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.

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Fig. 3 — DPPH free radical scavenging assay in vitro showing absorbance of N-(2-mercaptopropionyl) glycine (MPG), vitamin C (Vit-C), grape seed proanthocyanidin (GP), B. monnieri n-butanolic fraction (BM-ButFr) or standard (butylated hydroxytoluene: BHT) against their respective concentrations. Data are presented as mean ± SD of three separate experiments