There are five classes of antibodies, IgA, IgD, IgC, IgG and IgM. The IgM is the largest of these antibodies and is responsible for the first response of the body to attack the antigen.
This antibody is the largest of the antibodies and it responds first during an immune response (primary immune response).
This antibody is the most abundant antibody in the blood and it is the predominant antibody produced in the secondary response.
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