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Serotonin (5HT)-mediated vasoconstriction in the pulmonary arteries and pulmonary rami. In the pulmonary arteries (A) and the pulmonary rami (B), increasing concentrations of serotonin caused an increase in vessel tension. There was no difference between diet groups (control n = 10; high-Trp, n = 9) in the pulmonary arteries or the pulmonary rami.
