Biomarker

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Term Biomarker
Description Biochemical, physiological, and histological changes in organisms that can be used to estimate either exposure to chemicals or the effects of exposure to chemicals.
Definition Biomarker

Indicator (molecular, biochemical, cellular or organism) signaling an event or condition in a biological system or sample and giving a measure of exposure to, effect of, or susceptibility to, a xenobiotic. Biochemical, physiological, and histological changes in organisms that can be used to estimate either exposure to chemicals or the effects of exposure to chemicals.

References http://www.epa.gov/oswer/riskassessment/glossary.htm#b
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