Anti-h-eag antibodies enable researchers to detect and measure the h-eag antigen in biological samples. This target is a reported synonym of the KCNH1 gene, which encodes potassium voltage-gated channel subfamily H member 1. This protein is known to function in potassium ion transport and the transport of ions, among other biological roles. The human version of h-eag has a canonical amino acid length of 989 residues and a protein mass of 111.4 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the nucleus and cell membrane of cells and notably expressed in many tissues, such as the caudate and cerebral cortex. Other names for this target antigen include EAG, EAG, and EAG1.