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(biology, medicine, immunology) A hypersensitivity reaction to a self-antigen (any biomolecule of one's own body, usually a particular protein thereof). Often it does not occur until somehow triggered by an exogenous immune challenge (such as an infection), but once triggered it becomes its own ongoing molecular process that is independent of that stimulus.
Related-word data is supplemented by the Datamuse API. Datamuse results are suggestions, not automatic replacements.