Abstract
THE human I blood group system has several unusual features. The foetus and newborn have relatively strong i antigens on their red cells, and during the first 18 months of life this gradually converts to the adult status of a strong I antigen and a weaker i antigen1. The red cells of very rare adults retain the foetal i state2. Very little is known about the chemical nature of the red cell I antigen except that it probably contains carbohydrate3.
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COOPER, A. Soluble Blood Group I Substance in Human Amniotic Fluid. Nature 227, 508–509 (1970). https://doi.org/10.1038/227508a0
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DOI: https://doi.org/10.1038/227508a0
