E-G. AT-MSCs were transfected with 5 nM miR-21 mimic or control mimic, and were exposed to r.h. TGF-β1 2 days after transfection at indicated concentrations for another 24 h. The expression miR-21 was analyzed by qPCR-based miR-21 assay normalized on RNU6B (E), Samd7 protein level was shown by western blot (F), and human TGF-β1 expression was monitored by qPCR normalized on human GAPDH (G). Data is given as mean ± SEM of three independent experiments. 