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Fiu. 2. Mouse thymus lymphocytes 1 liour after whole-body X- irradiation with tldl* r. 

 Shght 2(a)-(c) to marked (d) chromatin derangement with focal condensation, nuclear oedema 

 and vacuolation ( | ). On the basis of single sections alone it cannot be decided whether 

 apparent membrane "fading" is merely due to tangential sectioning or whether it may in part 



represent real membrane defects ( 1 , nuclear membranes; \ , mitochondrial membranes). 

 Nl, large nucleolus with thin halo. X 30,000. 



