These H2R ELISA kits are immunodetection tools for measuring the levels of H2R in biological samples. H2R is an alias name of the human HRH2 gene, which encodes the protein, histamine receptor H2. Notably, H2R is known to play a role in chemical synaptic transmission and immune response pathways, among other functions. The HRH2 protein is 359 amino acid residues in length and 40.1 kilodaltons in mass. However, as many as 2 protein isoforms have been identified. It is localized to the cell membrane of the cell. This protein is known to be glycosylated. Other names for this target antigen include HH2R.