Transfection of pEYFP-ABR, pcDNA3.1-E2F1 and the according control vectors as well as ABR siRNA, CEBPα siRNA or control siRNA in U937 cells was performed via electroporation with a specific Nucleofactor Kit according to the manufacturer’s instructions (Lonza). 2 µg of DNA plasmid or 800 nM siRNA were used for each transfection. The pEYFP-ABR construct, as well as the empty vector pEYFP, were kindly provided by Professor Dr. N. Heisterkamp [23]. The siRNA for ABR and C/EBPα were purchased from Invitrogen. The siRNA sequences are provided in Supplementary Table 2.
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