Pathology of bone marrow for the vehicle, G-CSF, IL-12 pre-only, IL-12 post-only and IL-12 pre-post treatment groups following radiation. Bone marrow specimens for the EL4 lymphoma model (top) and the Lewis lung cancer model (bottom) are shown. For the EL4 model, vehicle (top, left), G-CSF (top, middle) and IL-12 pre-post (top, right) are shown. For the Lewis lung cancer model (bottom), vehicle (bottom, left) and IL-12 pre-only (bottom, middle) are shown. No G-CSF treated mice survived the second radiation dose. A normal (untreated) control bone marrow specimen is also shown (bottom, right).