A biomarker is a substance used as an indicator of a biological
state, most commonly of a disease.
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Cardiac Biomarker
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The prostatic specific antigen (PSA) is a typical well known biomarker.
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It is the process of molecular separation prior to an analytical
procedure such as Western Blotting or mass spec. This results in
the identification of proteins and other materials which can be
used as a biomarker.