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. 2021 Apr 29;12:251. doi: 10.1186/s13287-021-02286-w

Fig. 7.

Fig. 7

a Collagen type II (COL2A1) and b aggrecan (ACAN) gene expression in MenSCs and BMMSCs after stimulating chondrogenic differentiation for 21 days with activin A (50 ng/mL), TGF-β3 (10 ng/mL), and both TGF-β3 and activin A, where activin A was added only during first 2 days. Control cells were cultivated in the same chondrogenic medium without growth factors. Relative transcript level after normalization to geometric mean of B2M and RPS9 housekeeping genes. Data are presented as mean ± SD. Horizontal bars represent p ≤ 0.05