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. 2019 Apr 25;14(4):e0215536. doi: 10.1371/journal.pone.0215536

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© 2019 Kok et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 1 — Effects of extracts of IVD tissue from 5 different patients, applied at 3 concentrations on the metabolic activity of human MSCs, assessed using a MTT assay. The dashed horizontal line at 0.2 represents the mean of the control samples. All samples were tested in 8 fold. The * denotes a statistically significant difference (P<0.05) compared to the control samples.