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. 2020 Nov 4;20(21):6289. doi: 10.3390/s20216289

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Surface plasmon resonance (SPR) spectra with miR-155 concentrations ranging from 10⁻¹⁷ to 10⁻¹¹ M obtained using gold nanorod (Au NR) amplification. The arrow denotes the shift in the SPR angle. (b) Relationship between the SPR angle and miR-155 concentration using DNA probes with and without Au NRs. (a,b) Adapted under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/) [63]. Copyright 2019, The Authors. Published by Nature Communications.