The differentiation of SCs on PU, 1%Gastrodin/PU, 5%Gastrodin/PU scaffolds at 3 days. (A) NGF immunofluorescent images of SCs. (B) Quantitative analysis of the optical density from NGF staining. (C) Relative genes level of NCAM, GDNF and BDNF. (D) NCAM, EGR2, NGF, GDNF and BDNF protein expression of SCs measured by Western blotting and (E) the calculated corresponding protein levels. Data are expressed as the mean ± SD (n = 5). *p < 0.05; **p < 0.01; ***p < 0.001; ****p < 0.0001.