A(2) cord bloods do not react with Dolichos bif. anti-A and their H status
is equivalent to that of group O cord bloods, indicating that the A components
of these bloods are formed independently of H.
Bloods reacting with Dolichos bif. extract require H for the development of
their A(1) components and this is reflected in the lower H status of these bloods.
As the alternative pathway is necessary for the development of the first formed
parts of A both the alternative and the orthodox pathways are necessary for the
development of bloods with A(1) components.
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