10809
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 .
 GIRK channels, PKA, beta ( 2 ) AR
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 GIRK channels, PKA, beta ( 2 ) AR