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Figure 5 Expression of cyclooxygenase (COX)-2 in the membranous fraction of myocardium. (A) Representative Western blots illustrating COX-2 expression. (B) Densitometric quantification of COX-2 protein expressed as a percentage of the average value of control mice. Data are mean ± SEM. M = morphine. *p < 0.05 vs. control.