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Grading of histopathological fibrosis in the rat’s cardiac apex tissues. Grades 1, 2, 3 and 4 show low, moderate, high and intensive pathological changes, respectively. Iso: isoproterenol; MV: M. vulgare extract. Values are mean±SEM (n=4). ###p<0.001 vs. normal control, ** p<0.01, *** p<0.001 as compared with isoproterenol treated group using one way ANOVA with Student-Newman-Keuls post hoc test.
