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Match the immunoglobulin class in Group I with its properties in Group II.
Match the immunoglobulin class in Group I with its properties in Group II.
| Group I | Group II |
| P. IgG | 1. Major antibody in external secretions such as bronchial mucus |
| Q. IgA | 2. Protects against parasites |
| R. IgE | 3. Antibody that appears first in serum after exposure to an antigen |
| S. IgM | 4. Antibody present in highest concentration in serum |
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