| NOUN | substance | IgA, immunoglobulin A | one of the most common of the five major classes of immunoglobulins |
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| Meaning | One of the most common of the five major classes of immunoglobulins; the chief antibody in the membranes of the gastrointestinal and respiratory tracts. | |
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| Synonym | immunoglobulin A | |
| Broader | immunoglobulin, Ig, immune serum globulin, immune gamma globulin, immune globulin | A class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response |
| Spanish | IgA | |
| Catalan | IgA, Immunoglobulina A | |
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