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immunoglobulin a ABSTRACT. Immunoglobulins Igs are produced by B lymphocytes and play a key role in humoral immunity. Igs are classified into five isotypes IgG, IgA, IgM, IgE, and IgD. Their primary function is to recognize and bind to foreign antigens. When Igs bind to antigens, they facilitate phagocytosis and promote clearance mediated by other immune cells. It is an essential component in protecting