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Antibodies (agglutinins) of the A and B red cell antigens (agglutinogens)
A. Are present in fetal plasma.
B. Cause haemolysis of RBCs containing the A and B antigens when added to a suspension
of red cells in saline.
C. Do not normally cross the placental barrier.
D. Have a molecular weight in excess of 500 000.
E. Are monovalent

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