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Infants are born without a mature humoral immune system, causing a susceptibility to infection. One way infants are protected is through maternal immunoglobulin that crosses the placenta during pregnancy.

Which isotype(s) of immunoglobulin is/are known to cross the placenta?

Select ALL that apply.

A

IgM.

B

IgG.

C

IgD.

D

IgA.

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