Coupling of β2-adrenoceptor to G(i) proteins and its physiological relevance in murine cardiac myocytes - Rui-Ping Xiao; Pavel Avdonin; Ying-Ying Zhou; Heping Cheng; Shahab A. Akhter; Thomas Eschenhagen; Robert J. Lefkowitz; Walter J. Koch; Edward G. Lakatta (Circulation Research, 1999)