What is the most involved immunoglobin normally produced in response to antigens of human origin? It is often seen in the secondary response and has functions that include immunity to newborns, crossing the placenta, neutralizing toxins, and helping fight infection. It is also the major immunoglobin in normal serum and accounts for 70-75
1) IgA
2) IgD
3) IgE
4) IgG
5) IgM

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