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The time course of the expression of brain natriuretic peptide mRNA at 0, 3, 7, 10 and 14 days after surgery in left ventricle. Each value represents the mean ± S.E.M. of number of animals in parentheses. **P < 0.01, *P < 0.05, compared with day 0. BNP, brain natriuretic peptide.
