Abstract
Summary
Blood typing of cattle embryos of various ages indicated that the different antigenic factors that comprise a phenogroup (complex of antigenic factors) of the B locus do not develop simultaneously in ontogeny. Further, the same factor develops at different ages depending upon the phenogroup in which it occurs. It is concluded from these results that, in so far as age of development is concerned, the B locus of cattle does not behave as a physiologic unit.
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