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. 2019 Jan 11;10:25. doi: 10.1186/s13287-018-1123-7

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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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Fig. 6 — Cross-sectional MRI images of the knee joints 7 days post cell delivery. a T₁ MRI scans obtained using a 0.25-T Esaote MRI scanner and validated using a b MR750 3-T GE Healthcare scanner with T₂ sequences. Red star represents areas of blooming artefact due to the presence of significant amounts of SPION-labelled cells whilst yellow arrow represents the site of the osteochondral defect and green star the site of the femoral patella joint. F = femur, T = tibia, M = meniscus, P = patella, FC = femoral condyle