Title: HCN4 provides a 'depolarization reserve' and is not required for heart rate acceleration in mice.

Authors: Stefan Herrmann, Juliane Stieber, Georg Stöckl, Franz Hofmann, Andreas Ludwig

Journal, date & volume: EMBO J., 2007 Oct 31 , 26, 4423-32

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/17914461

Abstract