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Fig. 5. Effects of angiotensin II (ANG II; 10-8 mol l-1) before and after treatment with propanolol (10-8 mol l-1) and phentolamine (10-8 mol l-1), sotalol (10-7 mol l-1), isoproterenol (ISO; 10-9 mol l-1) and phenylephrine (Phenyl; 10-9 mol l-1) on stroke volume (VS) and stroke work (WS) in isolated and perfused paced eel hearts. For details, see Materials and methods. Percentage changes are shown as means ± S.E.M. of 4-5 experiments for each drug. *Significantly different from the control value (P<0.05).