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Cumulative concentration–response curves of phenylephrine precontracted thoracic aorta segments. (a) ATP evoked complete relaxation, whereas ADP evoked partial relaxation of the thoracic aorta. (b) UTP and UDP both evoked potent and complete relaxation. (c) ATPγS was more potent than ATP, while adenosine caused a small relaxation. Mean±s.e.m.; n=5.
