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. 2021 Sep 13;12:5409. doi: 10.1038/s41467-021-25677-2

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© The Author(s) 2021

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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Fig. 3 — Absorption (thin lines) and normalized emission (thick lines) spectra of o-DAPA (green), m-DAPA (black), and p-DAPA (red) in CHCl₃ (sample concentrations = 50 μM). The inset compares the absorption (thin lines) and emission (thick lines) spectra of o- and p-DAPA; the absorption spectra are normalized to the absorbance at the longest maximum absorption wavelengths (λ_max,abs), whereas the emission spectra are normalized to the maximum fluorescence intensity. Fl., fluorescence.