STO cells were cultured in DMEM high-glucose (Life Technologies), supplemented with 2 mMGlutaMax (Life Technologies), and 1 % nonessential amino acid (Life Technologies). Cells were treated with 10 μg/ml actinomycin C (Sigma) for 3 h. The actinomycin C-treated STO non-dividing cells were extensively washed in PBS and plated at 35, 000 cells/cm2 in gelatin-coated tissue culture dish.
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