Drop each label into the appropriate box, indicating which class of immunoglobulin is being described. Some labels are used more than once. Functions in B cell activation In exocrine gland secretions Crosses placenta Defends against bacteria and viruses On surface of most B lymphocytes Defends against bacteria, viruses, and toxins IgA In breast milk, tears, nasal fluid, gastric juice, and urine Causes agglutination in transfusion reactions Promotes inflammation and allergic reactions Activates complement proteins IgG

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Q: 皮

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