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Serum enhances adipogenesis of ASCs cultured in 2 % O2 and 21 % O2. a Formation of lipid droplets stained by Oil red O. Magnification ×400. Scale bars 100 µm. b High percentage of Oil red O stained area was observed in ASCs cultured with serum. c ASCs cultured in 21 % O2 with serum expressed high levels of adipogenic genes PPAR-γ, FABP4 and LPL. *p < 0.05 relative to before adipogenic induction; #p < 0.05 relative to 21 % O2 with serum; +p < 0.05 relative to 2 % O2 with serum
