Western analysis was carried out as previously described [38 (link)]. Primary antibodies used were p53 1:1000 (NCL-L-p53-DO7, Leica Biosystems Ltd, Newcastle upon Tyne, UK), MYCN 1:500 (sc-53993, Santa Cruz Biotechnology Inc., Dallas, TX, USA), MDM2 1:200 (OP46, Merck), p21WAF1 1:200 (OP64, Merck), p53 upregulated modulator of apoptosis (PUMA) 1:500 (ab9643, Abcam, Cambridge, UK) and GAPDH 1:500 (sc-25778, Santa Cruz). Experiments were at least n=3.
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