Anti-B9 domain-containing protein 1 antibodies enable researchers to detect and measure the B9 domain-containing protein 1 antigen in biological samples. This target is a reported synonym of the B9D1 gene, which encodes B9 domain containing 1. This protein is known to function in eye development and cilium assembly, among other biological roles. The human version of B9 domain-containing protein 1 has a canonical amino acid length of 204 residues and a protein mass of 22.8 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the cytoplasm of cells and widely expressed in many tissue types. B9 domain-containing protein 1 is a member of the B9D protein family.