Fa 



Fb 



TYPE Fb RED CELLS 



ANTIBODIES TO COMMON 

 ANTIGENS 



ANTIBODIES TO ANTIGENS WHICH DIFFER 



ABSORPTION WITH FB CELLS ABSORpT|ON WITH Fa CELLS 



I * I 



# 



+ ^ + 



[3. 



specific serum 

 Fa 



AGGLUTINATION 



+ 



I 



* 



SPECIFIC SERUM 

 FB 



AGGLUTINATION 

 + 



Figure 1 . --Diagrammatic representation of the method used to 

 discover antigenic differences in red blood cells . 



43 



