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The response of isolated porcine intrapulmonary arteries to 30 mM potassium chloride, at different ages, in normal animals and in those exposed to hypoxia, with and without endothelium. Each column shows the mean±s.e.mean. The number of animals used is indicated above each column. Solid columns indicate arteries with endothelium and empty columns those without. #P<0.05 ANOVA, *P<0.05 Student t-test.
