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. 2021 May 28;9:664168. doi: 10.3389/fcell.2021.664168

FIGURE 1.

FIGURE 1

Chondrocytes originate from MSCs and undergo a series of differentiation processes. Sox9 induces MSCs differentiate into chndrocytes and promotes proliferation, whereas Runx2 stimulates chondrocyte hypertrophic. BMPs affect certain stages of chondrocyte differentiation and regulate the expression of Sox9 and Runx2.