| NOUN | substance | autoantibody | an antibody acting against tissues of the organism that produces it |
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| Meaning | An antibody acting against tissues of the organism that produces it. | |
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| Narrower | rheumatoid factor | autoantibody that is usually present in the serum of people with rheumatoid arthritis |
| Broader | antibody | Any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response |
| Spanish | autoanticuerpo | |
| Catalan | autoanticòs | |
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