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Bar graphs showing the effect of ACh (0.3–3 μg/kg iv) on pulmonary and systemic arterial pressure before and after treatment with l-NAME (50 mg/kg iv) (A) and after treatment with l-NAME (50 mg/kg iv) and a combination of l-NAME (50 mg/kg iv) and ODQ (5 mg/kg iv) (B). n, No. of experiments. *P < 0.05.
