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Which one of the following immunoglobulins does constitute the largest percentage in human milk?

1. Ig M
2. Ig A
3. Ig G
4. Ig D

Correct answer: Ig A

Solution

IgA is the dominant immunoglobulin in human milk because it is the main antibody found in mucosal secretions. It helps protect the infant’s gastrointestinal tract by providing passive immunity.

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