Anti-B5R.1 antibodies enable researchers to detect and measure the B5R.1 antigen in biological samples. This target is a reported synonym of the CYB5R1 gene, which encodes cytochrome b5 reductase 1. The human version of B5R.1 has a canonical amino acid length of 305 residues and a protein mass of 34.1 kilodaltons. It is reported to be localized in the membrane of cells and widely expressed in many tissue types. This target antigen may also be known as B5R.1.