Which immunoglobulin requires the J chain to form its polymeric form in secretions?

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Multiple Choice

Which immunoglobulin requires the J chain to form its polymeric form in secretions?

Explanation:
J chain is a small polypeptide that enables the polymerization of certain immunoglobulins and their transport across mucosal surfaces. In secretions, IgA is produced as secretory IgA, a dimer formed when two IgA monomers are linked by the J chain and bound to the secretory component after transcytosis through the epithelial cells. This polymeric form is essential for stability and passage into mucosal secretions. Among the immunoglobulins listed, IgA is the one that normally exists as secretory polymeric IgA, whereas IgG, IgE, and IgD do not form this J chain–dependent polymeric secretions (IgM also uses the J chain but is a different polymeric form).

J chain is a small polypeptide that enables the polymerization of certain immunoglobulins and their transport across mucosal surfaces. In secretions, IgA is produced as secretory IgA, a dimer formed when two IgA monomers are linked by the J chain and bound to the secretory component after transcytosis through the epithelial cells. This polymeric form is essential for stability and passage into mucosal secretions. Among the immunoglobulins listed, IgA is the one that normally exists as secretory polymeric IgA, whereas IgG, IgE, and IgD do not form this J chain–dependent polymeric secretions (IgM also uses the J chain but is a different polymeric form).

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