WB analysis was carried out as previously described14 ,34 (link). The following antibodies were used in these assays: NGFR (C-20, Santa Cruz Biotechnology and D4B3, Cell Signaling Technology, Danvers, MA, USA), SOX2 (D6D9, Cell signaling Technology, Danvers, MA, USA), p53 (DO-1, Santa Cruz Biotechnology), p21 (CP74, Neomarkers, Fremont, CA, USA), PUMA (H-136, Santa Cruz, Biotechnology), and MDM2 (SMP14, Santa Cruz Biotechnology, 2A9, 2A10, and 4B11).
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