HCN3 refers to one of the subtypes of hyperpolarization-activated cyclic nucleotide-gated (HCN) ion channels, which are primarily responsible for generating the "pacemaker" currents in various cells, especially in the heart and brain. These channels are activated by hyperpolarization and are modulated by cyclic nucleotides such as cAMP and cGMP.
New to topics? Read the docs here!