Fig. 4From: Cryopreservation in 95% serum with 5% DMSO maintains colony formation and chondrogenic abilities in human synovial mesenchymal stem cellsAnalysis of chondrogenesis. a Representative macroscopic appearance of cartilage pellet. Synovial mesenchymal stem cells (MSCs) were derived from four donors. In the 100% fetal bovine serum (FBS) group, no cartilage pellets were formed. b Pellet weight. Data are shown as means ± SD (n = 4 for each donor). *p < .05 by the Friedman test followed by Dunn’s multiple comparisons. ND: not detected. c Representative histological sections stained with toluidine blue and immunostained for collagen type IIBack to article page