Which of the following immunoglobulins has the highest mean serum concentration in humans_________________?
Correct answer: C. IgG
- A. IgA
- B. IgD
- C. IgG
- D. IgM
Explanation
IgG is the predominant immunoglobulin in normal human serum, accounting for most circulating antibody and also crossing the placenta. IgA is prominent in secretions, while IgM is the largest early-response antibody.
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