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Vascular endothelial growth factor (VEGF) release of adipose-derived, mesenchymal stem cells at 1%, 2%, and 20% O2 with and without the HIF-1 inhibitor in (A) 2-D and (B) 3-D culture conditions over a period of 4 weeks. The values have been normalized by a viable cell number and represent the mean±standard deviation.
