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biological, chemical, or physical agent that stimulates a characteristic function or causes a particular response, especially an inflammatory response.
a biological membrane that separates the interior of all cells from the outside environment.
the factor that changes in an investigation and is not under the control of the investigator....
the hormone produced by the beta cells of the Islets of Langerhans in the pancreas, which...
the cavity used for transport purposes. It has one opening to the environment through which...