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A: effect of rolipram (Rol; 20 μM) on Ilo (1 μM)-induced increases in cAMP in rabbit erythrocytes (n = 7). Erythrocytes were incubated with Rol for 30 min before stimulation with Ilo for 15 min. B: effect of Rol (20 μM) on Iso (1 μM)-induced increases in cAMP in rabbit erythrocytes (n = 9). Erythrocytes were incubated with Rol for 30 min before addition of Iso for 30 min. Values are means ± SE. *Different from respective control (P < 0.05); †different from all other values (P < 0.05).
