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hBMSC-EXOs promote cartilage formation after injury in rabbits. (a) The experimental design. Defects were generated in the articular cartilage of rabbits, and then, hBMSC-EXOs were given to rabbits via intra-articular injection for 4 times. (b) The gross appearance of rabbit articular cartilages. (c) H&E staining. Scale bar = 1000 μm. EXOs-low: 1 × 1010/ml; EXOs-high: 5 × 1010/ml.
