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. 2021 May 25;11:10896. doi: 10.1038/s41598-021-90383-4

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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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Representative PET images of rats with cell administration via tail vein (A), common carotid artery (B), and intra-myocardial injection (C). High radiotracer activity is seen in the lung, head, and heart in the group of animals with tail vein administration, carotid artery injection, and intra-myocardial injection, respectively. Results of tissue counting of the lung (D), brain (E), and heart (F) with different routes of cell administration are shown in the graphs.