Discussion
How many types of antibodies are there?
Answer: A
Correct answer: Five
There are five classes of antibody, distinguished by their heavy chains: IgG, the commonest, and the only one crossing the placenta; IgM, a pentamer made first in a new response; IgA, which guards mucosal surfaces and appears in milk; IgE, involved in allergy and in defence against parasites; and IgD, a receptor on naive B cells.
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