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The effect of atypical β-adrenoceptor agonists in rat thoracic aorta. Results are expressed as percentage relaxation of tone induced by noradrenaline. Values are mean±s.e.mean of n observations. (a) Effects of cyanopindolol, CGP 12177A, ZD 2079, ZM 215001 and BRL 37344 (n=6–19). (b) Effect of propranolol (0.3 μM) on relaxation induced by CGP 12177A (n=8–19). (c) Effect of propranolol (0.3 μM) on relaxation induced by ZM 215001 (n=4–6).
