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. 2018 Mar 15;8:4590. doi: 10.1038/s41598-018-22892-8

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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/.

PMC Copyright notice

Five BAA fluorophores were selected for further characterization & multicolor imaging. BAA-37a, BAA-22a, BAA-5a, BAA-2a and BAA-39a were selected for further study. Their (A) chemical structures, absorbance (λ_{max ABS}) and emission (λ_{max EM}) maxima, extinction coefficient (ε) and quantum yield (Φ_fl) are shown for all five compounds. The normalized (B) absorbance and (C) emission spectra as well as (D) photostability are shown for all five compounds.