|  IgA 
 
 one of the most common of the five major classes of immunoglobulins;
 the chief antibody in the membranes of the gastrointestinal and respiratory tracts
 • Syn:
 immunoglobulin A
 • Hypernyms:
 immunoglobulin, Ig, immune serum globulin, immune gamma globulin, immune globulin
 
 
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