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. 2018 Jan 12;8:591. doi: 10.1038/s41598-017-18995-3

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© The Author(s) 2018

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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Schematic diagram. The schematic diagram shows that the reaction components were printed on parchment paper, and the fluorescence energy transfer between Eu-cAMP and ULight-anti-cAMP was determined under four different conditions, including: (A) absence of free cAMP; (B) presence of free cAMP; (C) presence of cAMP and PDE4B enzyme; and (D) presence of cAMP, PDE4B enzyme, and PDE4B inhibitor.