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PD1.6 cells overexpressing both ICN-Notch1 and Bcl-2 become resistant to dexamethasone (Dex)-induced apoptosis. The cells were exposed to 100 nM Dex for the indicated time periods, followed by analysis of propidium iodide (PI) positive cells on flow cytometry. Untreated cells were used as control. *P < 0.04 **P < 0.01.
