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MMP9 and its inhibitor, TIMP2, protein expression levels in arecoline-treated rats. (a) MMP9 and TIMP2 protein expression levels were examined by Western blot analysis of left ventricular samples from control, low-dosage, and high-dosage arecoline-treated rats. (b) Data were quantified densitometrically and expressed as mean ± SEM. Protein expression was normalized to β-actin expression. *Significant difference (P < 0.05).
