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. 2018 Jan 12;8:638. doi: 10.1038/s41598-017-18947-x

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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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Subcellular distribution study of TMR conjugated PNA using confocal fluorescence microscopy in HeLa pLuc705 cells. Cells were incubated with 3 μM of PNA conjugates, irradiated and imaged using LSM780 with 0.7 mW laser intensity. (a) 0 min (b) 3 min (c) 5 min irradiation. The white arrows indicate endosomes before irradiation. The green arrow shows the fluorescence change of an area before and after irradiation.