passages.id: split_4_test_1211_passage
passages.type: progene_text
passages.text: Here , we characterized GPCRs coupled to either G(q) ( M(1) muscarinic acetylcholine receptor ( M(1) AchR ) and P2y ( 1 ) and P2y(2) purinergic receptors ) or G(i) ( somatostatin and AT1 angiotensin receptors ) in wild type and arrestin antisense HEK293 cells .