2.5-5.0 x 10^(5) cells/60 mm dish X-rays 5000R (or MMC) MEF (ICR) MEF (ICR) X-rays 5000R (or MMC) 2.5-5.0 x 10^(5) cells/60 mm dish MEF (ICR) X-rays 5000R (or MMC) 2.5-5.0 x 10^(5) cells/60 mm dish