NSCs were harvested from embryonic C57BL/6J mouse brain (E14) as previously described [14 (link)]. Briefly, cells were resuspended in a DMEM/F12 medium containing B27 (2%, Gibco, USA), EGF (20 ng/ml, BioLegend, USA), bFGF (20 ng/ml, BioLegend, USA), and ITSS (10 μg/ml, Roche, Switzerland) and cultured in a cell incubator. The medium was changed every 3 d, and cells were passaged when the neurospheres grew to 50-100 μm diameter. Cells were plated on poly-D-lysine and laminin precoated coverslips for further experiments.
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