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DISCUSSION 
J. Moor-Jankowski, New York University- 
School of Medicine, New York: Dr. Stormont, 
certainly in your work you have tried to use 
your antisera for testing closely related species 
to the species in which they are produced. Could 
you say a few words about this? 
Dr. Stormont: Dr. Moor-Jankowski wants 
to know whether we use the antisera produced 
for blood-typing cattle for typing other closely 
related species. The answer is yes. Some of the 
antisera or cattle blood typing reagents are 
most effective in sheep blood tjrping. We have a 
blood group system in sheep known as the B 
system, which is homologous to the B system in 
cattle. Some of the antibodies that react in the 
B system in sheep, and iso-immunizations of 
sheep, cross-react neatly with those in the B 
system of cattle. The C system in sheep and 
cattle are homologous. The A system of man, 
the RO system of sheep, the J system of cattle, 
the AO system of pigs, and even the TR system 
in dogs are all related through antigen A of 
man. That is a long series of cross-reactions 
involving the A substance. 
