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. 2020 Jun 29;6:52. doi: 10.1038/s41378-020-0167-x

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© The Author(s) 2020

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. 2 — a Microscope image of the generation of tumor droplets. b Graph of droplet diameter against oil flow rate at a constant water flow rate of 1 μL/min. c Microscope image of the collected cell droplets. d Graph of cells encapsulated in the individual droplets against oil flow rate. e Microscopic images of the generated tumor spheroid after 24 h in the droplet. f Quantitative analysis of tumor spheroid size by cell concentration. All scale bars are 100 μm