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. 2018 Jun 9;19(6):1715. doi: 10.3390/ijms19061715

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Effect of iPSC-Exo on the proliferation of human dermal fibroblasts (HDFs). Serum-starved HDFs were treated with iPSC-Exo for 48 h. The population of live HDFs was determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The total population of the iPSC-Exo-untreated group was regarded as 100%, and the populations of other groups were estimated as relative values. * p < 0.05, ** p < 0.01 compared to the iPSC-Exo-untreated group. Error bars indicate standard deviations of triplicate samples in a single representative experiment.