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. 2019 Oct 4;9:14314. doi: 10.1038/s41598-019-50043-0

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© The Author(s) 2019

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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Uptake of nanoparticles in macrophages studied by MRI. (a) ¹H MRI and (b) ¹⁹F MRI of Raw 264.7 macrophages stimulated with LPS (1 µg/ml) in the presence (+) or absence (−) of folic acid (FA) (as competitor) and incubated with NP and Folate-NP (1 mg/ml) for 6 or 24 hours. As reference (Ref) 3.8 µmol of PFOB in CDCl₃ was used. A total of 2.75 million cells were used. (c) Quantification of the ¹⁹F SNR signal shown in b. Error bars indicate SD, n = 3.