Friend spleen focus-forming virus
  
    					
  
  
               - Friend spleen focus-forming virus
 
               - 
Defective 
virus found in certain strains of 
Friend helper virus, detected by its ability to form foci in spleens of mice, and believed to be responsible in those strains for the production of 
a leukaemia associated with 
polycythemia rather than anaemia.
 
               
               
               Dictionary of molecular biology.
   2004.
 
 
 
  
  					
  
  					
  						
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