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. 2014 Sep 26;16(5):441. doi: 10.1186/s13075-014-0441-0

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© Tsuchida et al.; licensee BioMed Central Ltd. 2014

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Safranin O staining of newly formed tissue by healthy, cartilage defect and osteoarthritis chondrocytes. Safranin O staining of newly formed tissue after redifferentiation of chondrocytes on type II collagen-coated filters after 28 days of culture. (A) Nonexpanded healthy chondrocytes, (B) nonexpanded cartilage defect chondrocytes, (C) nonexpanded osteoarthritic chondrocytes, (D) expanded healthy chondrocytes, (E) expanded cartilage defect chondrocytes, and (F) expanded osteoarthritic chondrocytes.