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Survival of clonogenic bone marrow progenitors in vitro on delayed addition of SCF or after γ-irradiation. Survival of (A) SCF-responsive preprogenitors and (B) granulocyte progenitors. Three mice of each type were sampled. Survival after γ-irradiation of (C) preprogenitors responsive to FL, (D) granulocyte colony-forming cells responsive to SCF, and (E) macrophage colony-forming cells responsive to M-CSF. Vav-bcl-2 and nontransgenic littermate data are shown as ● and ○, respectively.
