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. 2017 Jul 5;7:4629. doi: 10.1038/s41598-017-04924-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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(A) Photocurrent responses of the PEC immunosensor with different concentrations of PSA: (a to j) 0.05, 0.1, 0.5, 1, 10, 100, 500, 1000, 5000, 10000 pg·mL⁻¹. (B) The logarithmic calibration curve for PEC immunosensor for the detection of different concentrations of PSA.