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Positive correlation between left atrial size (mm) and ornithine decarboxylase (ODC) activity (pmol/hr/mg protein) (A) and negative between N1‐acetypolyamine oxidase (APAO) (mIU/mg protein), with N1‐acetylspermidine as substrate (B). Isoamylamine (nmol/mg protein) negatively correlated with septal wall thickness (C). The lines represent the linear regression analysis.
