“…Cells were grown to a density of 80% and the culture medium replaced by MEM with 0.5% FCS for synchronisation over 48 h. The cells were then transferred back to MEM +10% FCS for 24 h followed by harvesting and counting. 1.5 x 10 6 cells were fixed in 70% ethanol for at least 18 h at -20ºC, and treated with PI/RNase Staining Buffer (BD Pharmingen, San Diego, CA, USA) for 30 min at 37ºC in the dark (Kues, et al, 2000;Nishikiori, et al, 2008). The DNA content was analysed by flow cytometry using a BD FACSCanto II flow cytometer (BSBioscience, San Jose, CA).…”