Answer / Km Neeshu Chahal

Immunoglobulin A (IgA) is a type of antibody primarily found in mucosal secretions such as saliva, tears, and breast milk. It plays a crucial role in the immune system's first line of defense against pathogens that enter through mucous membranes. IgA exists in two forms: monomeric (dimers linked by a joining protein called J chain) and polymeric (aggregates of multiple dimers).

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