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3H-cAMP accumulation in response to cyanopindolol in a) CHO tβtrunc cells, b) CHO tβ3C cells and c) CHO tβ4C cells. Bars represent basal 3H-cAMP accumulation and that in response to 10 µM isoprenaline. Data points are mean ± s.e.mean of triplicate determinations. These single experiments are representative of a) 4, b) 5 and c) 5 separate experiments.
