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. 2017 Jun 12;7:3215. doi: 10.1038/s41598-017-03033-z

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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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OPD reaction progress. Reaction product absorbance at 417 nm in buffer with substrates without presence of illite (blue), in buffer with illite and substrates (black) and in 20:1 ratio of Dx-rich phase/PEG-rich phase with substrates (red). Hydrogen peroxide was held in excess at 8.8 mM and OPD was 500 µM in 100 mM HEPES buffer, pH 7.5. Error bars represent the standard deviation of the measurements.