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. 2022 Dec 22;7:75. doi: 10.1038/s41536-022-00269-w

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Fig. 6 — a Gross appearance of the cartilage at 6 and 12 weeks after the injection. b Representative H&E staining images of rat knee joints. Scale bar = 500 μm. c Safranin O/Fast Green staining of rat knees 6 and 12 weeks after the hydrogel injection (Scale bar = 500 μm).