Which answer is true for IgA?
A) The Fc portion of secretory IgA binds to mast cells and basophils.
B) It is a typically found as a tetramer in the serum.
C) It is a typically found as a dimer in the serum.
D) It cannot bind to antigen when present in the serum.
E) It picks up the secretory component as it passes through mucosal cells.
Ans: E) It picks up the secretory component as it passes through mucosal cells.
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