The membrane protein encoded by this gene is a hyperpolarization-activated cation channel that contributes to the native pacemaker currents in heart and neurons. The encoded protein can homodimerize or heterodimerize with other pore-forming subunits to form a potassium channel. This channel may act as a receptor for sour tastes.,HCN1,BCNG-1,BCNG1,EIEE24,HAC-2,Neuroscience,Cardiovascular,Heart,Contractility,Cardiac arrhythmias,HCN1