DAOY and UW228 cells were seeded at a density of 150,000 cells per well in six-well plates and maintained in DMEM containing 10% FBS and primocin. Cells were transfected as indicated above and replated at a density of 30,000 cells/well in a six-well plate. Approximately 24 h post-plating, cells were exposed to 8 Gy dose of radiation. After 120–144 h post-radiation, cells were collected by trypsinization. To each 10 μL aliquot of cells, 10 μL of trypan blue dye was added. Cell counting was performed using the T-20 automated cell counter (Bio-Rad, Hercules, CA, USA).
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