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Alteration of levels of immunoreactive ET-1 in plasma after inhalation of urban dust and ozone for 4 hours, followed by 20-hour recovery in clean air. Results are presented as percentage of air control and expressed as mean ± SE; n = 9 to 15 animals. aEHC main effect, P = 0.018 (multiway ANOVA performed on raw data, pg of ET-1/ml of plasma).
