Agglutination‐inhibition studies have shown the presence of blood group substance H activity in canine saliva, and of blood group substance A activity in the saliva of Tr+ dogs. H substance could not be demonstrated on canine red cells, indicating that the cellular A‐like antigen, Tr, is formed independently of H. Nonsecretor status, and an antigen comparable to the human B antigen, have not been detected.
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Bowdler et al. (1973) studied this question.
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