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Fig. 1. Original recordings from one turtle (Trachemys scripta) showing changes in the recorded variables following injection of ET-1 (120 pmol kg-1) and ETB-agonist (150 pmol kg-1). Arrows indicate the time of injection. Psys, systemic arterial pressure; LAo, left aortic blood flow; Ppul, pulmonary arterial pressure; LPA, left pulmonary blood flow.