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Bar graphs comparing heart weights in control rats (A), monocrotaline rats (B), and monocrotaline-treated + sodium nitrite (3 mg/kg ip daily for 21 days) (C). The atrium was removed, and the weight of the right ventricle relative to the weight of the left ventricle plus septum in the three groups of rats was compared. n = number of experiments. * indicates P < 0.05, when compared to control and ** when compared to monocrotaline treatment.
