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B-type natriuretic peptide (BNP), a peptide hormone, was determined by electrochemical enzyme immunoassay through the following procedure. First, a certain concentration of sample BNP was added to the solution containing anti-BNP antibody modified with acetylcholinesterase (AChE) to undergo the immunological reaction. Then BNP-modified gold particles were added into the BNP/AChE-labeled anti-BNP antibody...
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