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. 2018 Feb 12;8:2802. doi: 10.1038/s41598-018-21274-4

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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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Viability analysis and proliferation assay of 3D cell-laden hydrogel scaffolds fabricated by OCT-IFBP and direct printing method: (A) comparison of live/dead staining fluorescence microscopy images between OCT-IFBP and direct printing group (green represents living cells, whereas red represents dead ones); Scale bar = 500 µm (B) Comparison of viability; (C) comparison of proliferation;. Error bars represent the intra-batch variation.