| NOUN | substance | reagin | an immunoglobulin E that is formed as an antibody against allergens (such as pollen) |
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| Meaning | An immunoglobulin E that is formed as an antibody against allergens (such as pollen); attaches to cell membranes causing the release of histamine and other substances responsible for the local inflammation characteristic of an allergy. | |
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| Broader | immunoglobulin E, IgE | One of the five major classes of immunoglobulins |
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