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Variable effects induced by PGE2 in human isolated pulmonary veins. Experiments were performed in presence of indomethacin (1.7 μM), L-NOARG (0.1 mM) and BAY u3405 (1 μM). Responses were expressed as per cent of the norepinephrine (10 μM) contraction. Each symbol indicates data obtained with one lung sample.
