Enhanced Gi signaling selectively negates β 2-adrenergic receptor (AR)- but not β1-AR-mediated positive inotropic effect in myocytes from failing rat hearts - Rui-Ping Xiao; Sheng-Jun Zhang; Khalid Chakir; Pavel Avdonin; Weizhong Zhu; Richard A. Bond; C. William Balke; Edward G. Lakatta; Heping Cheng (Circulation, 2003)