Abstract
The level of blood-group A^1-specified α,3'-N-acetyl-D-galactosaminyl-transferase in the serum of recently-delivered women was found to be appreciably lower than the level of this enzyme in the serum of non-pregnant adults and of newborn infants ; a similar but less striking decrease was observed in the levels of the A^2-specified a,3'-N-acetyl-D-galactosaminyltransferase and the H-specified α,2'-L-fucosyltransferase. Although the red cells of newborn infants are known to have relatively few A and H antigen sites, the serum of neonates was found to have a level of A^1- and A^2-dependent N-acetylgalactosaminyltransferases and Hdependent fucosyltransferase as high as, if not higher than, the serum of non-pregnant adults. This finding is compatible with the fact that the haemopoietic tissue contributes only about 20% of the serum transferase level.
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