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Time course of the changes in histological appearance during in vitro chondrogenesis of synovial MSCs cultured with or without petaloid RCP. An initial 125k synovial MSCs were cultured with or without petaloid RCP in chondrogenic medium for 7, 14, and 21 days for safranin‐o staining and for 1, 7, and 21 days for toluidine blue staining.
