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Definition of Biomarker:
A normal metabolite that, when present in abnormal concentrations in certain body fluids, can indicate the presence of a particular disease or toxicological condition.[1].
This is the common definition for Biomarker, other definitions can be discussed in the article


  1. Martin E. and Hine R.S. (2000). Oxford Dictionary of Biology (4th Ed). Oxford University Press: New York, (USA). 641pp.