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. 2018 Aug 13;9:3217. doi: 10.1038/s41467-018-05568-9

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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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Fig. 5 — NIR fluorescence properties of cyclo-WW + Zn(II) in DMSO. a TEM image of the self-assembled nanospheres. Scale bar: 300 nm. b Emission vs. excitation profile of the nanospheres. c Extracted emission spectra of the nanospheres. d Visible to NIR photos of cyclo-WW + Zn(II) DMSO solution under various wavelengths. e Photobleaching and (f) photostability characterization of the cyclo-dipeptide nanoparticles (abbreviated as cPNPs) and of the fluorescent dyes ICG and Cy5.5, as controls