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The mucosal epithelia together with adaptive immune responses, such as local production and secretion of dimeric and polymeric immunoglobulin A (IgA), are a crucial part of the first line of defense against invading pathogens. IgA is primarily secreted as SIgA and plays multiple roles in mucosal defense. The study of SIgA-mediated protection is an important area of research in mucosal immunity but...
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