194 F- HAGUENAU AND K. H. HOLLMANN 



since they are found in human cancers of varied origin and thus correspond 

 to a distinctive ultrastructural pattern common to all of these. 



Furthermore a relationship exists between the presence of A cells in 

 a tumour and its radiosensitivity. These cells thus may be of important 

 prognostic value. 



Acknowledgments 



Work referred to in this paper has been aided by Grant C-4602 of the 

 U.S. Public Health Service, Figure 1 1 is due to the courtesy of Prof. T. O. 

 Caspersson. 



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