The undifferentiated PC12 cells (obtained from the Cell Bank at the Chinese Academy of Sciences, Shanghai, China) were cultured and maintained for 48 h in the differentiation medium (95% high-glucose DMEM, Gibco, USA) supplemented with 1% horse serum (HyClone, USA), 3% fetal bovine serum (Sijiqing, China), 1% penicillin-streptomycin (HyClone, USA) and 50 ng/mL nerve growth factor (R&D Systems, USA).
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