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β-Agonist-promoted intracellular cAMP accumulation is increased in cultured TG1 ASM cells overexpressing Gαs. Adhered cells were treated with 100 μM ascorbic acid (basal) or 10 μM isoproterenol + ascorbic acid (Iso) for 30 min at 37°C. Values are means ± SE; n = 5 experiments. *P < 0.01 vs. NTG.
