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. 2017 Aug 8;7:7483. doi: 10.1038/s41598-017-07756-x

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© The Author(s) 2017

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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Arginyl dipeptides Ala-Arg (a), Arg-Ala (b), and Arg-Pro (c) elicited responses in a concentration-dependent manner. HBO cells were stimulated with six different dipeptide concentrations: 5, 10, 50, 100, 250, and 500 µM (x-axis) and each point represents the average of data collected from independent experiments. The percentage of cells responding were measured by intracellular Ca²⁺ changes (y-axis). Each experiment was performed eight times. For each panel the peak number of responding cells/total cells examined were: 184/582 (a), 92/276 (b) and 110/430 (c).