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. 2021 Aug 3;9:720477. doi: 10.3389/fcell.2021.720477

FIGURE 1.

FIGURE 1

Joint cells) include chondrocytes, osteoblasts of subchondral bone, synovial mesenchymal stem cells (MSCs) and fibroblasts, and infrapatellar fat pad MSCs. The production and release of exosomes by stem cells may be involved in the regulation of joint homeostasis.