INJURY AM) RlXlOX l.KV I.N M.U 1 R()N-IRKAl)I.Vn:i) A.MMAL.S 



60 to 100 days after transplantation, presumably is an immune reaction 

 between <;raft and host. 



Several protective experiments of this same kind have been carried out 



Saline injected (30) 



Streptomycin injected (32) 



/; Bone marrow injected (32) . 



Bone marrow plus 

 streptomycin injected (32) 



Unirradiated 



controls (32) ^-^ \ 



30 60 90 120 150 180 

 Days after neutron irradiation 

 (350-360 rad) 



Figure 4. Survival of similarly treated groups of 

 mice as illustrated in Figure 3, for a period up 

 to six months after exposure to neutrons. Note 

 that the mice protected by the bone-marrow 

 cells do not show significant delayed or ' homo- 

 logous' deaths (60-90 days) from immune 

 reactions between host and graft. 



Table 1. Summary of data for neutron-irradiated mice 



226 



