A cold agglutinin, FI, reacted with an erythrocyte antigen, which was inactivated
by neuraminidase. It resembled anti-I antibodies in reacting more strongly with
erythrocytes of adults than with cord blood cells. However, unlike l, this ‘new’ antigen is
destroyed by neuraminidase treatment. This antigen is also distinct from Pr, Gd and Sa type
antigens which are equally expressed on cord and adult erythrocytes.
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