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The protein concentrations of VEGF (A) and BDNF (B) in different conditioned media were detected with ELISA. Hypoxia significantly enhanced the secretion of VEGF and BDNF compared with normoxia. *p<0.05, **p<0.01, 4% HCM compared with NCM; ##p<0.01, 1% HCM compared with NCM (n = 3).
