Effect of irradiation on iron deposition in the liver in NHPs. Liver tissue was obtained from NHPs at the indicated times of euthanasia after exposure to various doses of radiation. Fixed tissues were stained with Prussian blue; representative images show 10× and 20× magnification. Panel A: Sham irradiation (0 Gy); Panel B: Sublethal irradiation, 4 Gy, 30 days; Panel C: 5.8–8.5 Gy, 13–60 days; Panel D: Supralethal irradiation, 12 Gy, 4–7 days.