Survival in lethally irradiated mice given transplants of stem cell–enriched BM control cells, MSCVneo–infected cells, or MSCVneo Egr-1–infected cells.

After irradiation of Balb/c mice, infection of BM cells, and selection in G418, 10 mice in each group were given injections in the tail vein with the indicated infected BM cells (0.2 × 10⁶ cells per 300 μL PBS per mouse). Cell-free control animals were given injections of 300 μL PBS. Mice were housed and fed in a sterile environment and monitored for survival for up to 28 days.