cAMP sensitivity of HCN pacemaker channels determines basal heart rate but is not critical for autonomic rate control - Schweizer, Patrick Alexander; Duhme, Nana; Thomas, Dierk; Becker, Rüdiger; Zehelein, Jörg; Draguhn, Andreas; Bruehl, Claus; Katus, Hugo (Circulation. Arrhythmia and electrophysiology, 2010)