Step Procedure Equipment Data collected 1Mice irradiated at 8-10 wks of age Gamma irradiator - 2Mice monitored over next 26 wks; euthanized when moribund - Number of days without respiratory distress3 Bronchoalveolar lavage Cannulus Inflammatory cell counts 4 Histopathology Microscope and camera Extent of fibrosis, mast cell counts, alveolitis score