Drug response experiments <i>in vitro</i>.

<p>(<i>Left</i>) Measurement of <i>in vitro</i> cell kill in cell culture for <i>Eμ-myc/Arf-/-</i> and <i>Eμ-myc/p53-/-</i> cells after 48 hours at 50 nM Dox concentration (N.S.: not statistically significant). (Right) Results from a flow cytometry study were used to measure apoptotic cells. <i>Eμ-myc/p53-/-</i> cells are displayed along the top row with <i>Eμ-myc/Arf-/-</i> cells along the bottom; controls (no drug) are in the left column, and drug-treated cells (Dox) are in the right column. For each block, lower left quadrant represents live (proliferating) cells; lower right quadrant shows apoptotic cells; upper right quadrant shows dead cells.