Dissociated cells (tumor-derived and normal NSCs) were plated at 50 000 cells/well in 6 well plates (Nunc, VWR Norge) coated with 15 μg/ml poly-L-ornithine (Sigma, St. Louis, MO). DMEM/F12 medium was augmented with fetal calf serum (3.75 %; PAA Laboratories, Pasching, Austria) and 25 μl/ml B-27 with vitamin A (Invitrogen), 1 μg/ml laminin and 10 μl/ml of Pen/Strep. All cultures were kept in an incubator at 5–6 % CO2, pH 7.2-7.4 [40 (link)].
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