Fig. 5
![Fig. 5](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs11658-017-0055-z/MediaObjects/11658_2017_55_Fig5_HTML.gif)
Growth factors detected in the conditioned medium in standard (S+) and hypoxic (H+) atmospheres. Concentrations of VEGF (a), FGF (b), EGF (c) and PDGF (d) were measured using ELISA. The results are expressed as means ± SEM (n = 19 standard culture, n = 15 hypoxic). *p < 0.01 compared with the control in the same atmosphere (S- or H-). **p < 0.05 compared with S+