Kuschel M, Zhou Y-Y, Spurgeon HA, Bartel S, Karczewski P, Zhang S-J, Krause E-G, Lakatta EG, Xiao R-P. β2-adrenergic cAMP signaling is uncoupled from phosphorylation of cytoplasmic proteins in canine heart. Circulation [Internet]. 1999;(18):2458-2465.