The total mRNA of cells was extracted using TRIzol (Thermo, USA) and cDNA was synthesized from 2 μg of total RNA using an RT kit (Thermo, USA) following the manufacturer's instructions. The mRNA quantity of Mdm2 gene was assessed by quantitative real-time PCR (ABI, USA). The primers used for amplification are as follows: β-actin F, CCCATCTATGAGGGTTACGC; β-actin R, TTTAATGTCACGCACGATTTC; Mdm2 F, TTGATGATGGCGTAAGTGA; Mdm2 R, AGGCTGTAATCTTCTGAGTC.
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