Ready-to-use ELISA kits are available for the detection of hyperpolarization-activated, cyclic nucleotide-gated K+ 3, an alias of the protein, hyperpolarization activated cyclic nucleotide gated potassium channel 3. The official gene symbol is HCN3. The protein, with a mass of 86 kDa and length of 774 residues, is reported to be membrane-associated. It is a member of the Potassium channel HCN family and may be known by other names, including: potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 3.