In vivo survival of lethally irradiated (DBA/2 × B10.D2)F1 mice either receiving no cells (control, ▴) or grafted with B10.D2 cells from adult PB (···), TCD BM (–··–), BM, and lymph nodes (–·–) or NBB collected on days 0 (––), 2 (– –), and 5 (— —) after birth. Mortality was recorded daily and mice were examined for the presence of clinical GVHD (number of live mice/total number of mice).