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biological, chemical, or physical agent that stimulates a characteristic function or causes a particular response, especially an inflammatory response.
pollutant gases such as nitrogen monoxide and nitrogen dioxide. They are produced during ...
a structure that is used by molluscs for feeding. It is a minutely toothed, chitinous ribbon...
the protective layer of fibrous connective tissue which surrounds each kidney.
mostly columnar epithelium with cilia that line the nasal cavity, trachea, bronchi, fallopian...