tokens: We conclude that , both in atrial myocytes and in Xenopus oocytes , beta-adrenergic stimulation potentiates the ACh evoked GIRK channels via a pathway that involves PKA catalyzed phosphorylation downstream from beta ( 2 ) AR .
folded_tokens: we conclude that , both in atrial myocyte and in xenopus oocyte , beta-adrenergic stimulation potentiate the ach evoke girk channel via a pathway that involve pka catalyze phosphorylation downstream from beta ( 2 ) ar .