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The dose–response relationship, or exposure–response relationship describes the magnitude of the response of a biochemical or cell-based assay or an organism, as a function of exposure to a stimulus or stressor after a certain exposure time. Dose–response relationships can be described by dose–response curves, or concentration-response curves. This is explained further in the following sections. A stimulus response function or stimulus response curve is defined more broadly as the response from any type of stimulus, not limited to chemicals.