IgA, or Immunoglobulin A, is an antibody that plays a crucial role in the immune system by providing protection at mucosal surfaces such as those found in the respiratory and gastrointestinal tracts. It is primarily present in secretions like saliva, tears, and breast milk, serving as a first line of defense against pathogens entering the body through mucous membranes. This antibody helps prevent infections by neutralizing bacteria and viruses, highlighting its importance in both innate and adaptive immune responses.
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