Biology, 25.03.2020 04:54 hodgesr3346

The ABO blood group antigens do not trigger the formation of memory B cells, so every
immune response is like a first exposure to the antigen. IgM, not IgG antibodies, are
produced in an initial immune response. Explain why a fetus with type B blood is not in
danger if the mother has type A blood. Assume that this is a second pregnancy.

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