Anti-HBEBP1 antibodies enable researchers to detect and measure the HBEBP1 antigen in biological samples. This target is a reported synonym of the TMEM203 gene, which encodes transmembrane protein 203. This protein is known to function in the regulation of intracellular calcium and spermatogenesis, among other biological roles. The human version of HBEBP1 has a canonical amino acid length of 136 residues and a protein mass of 15.8 kilodaltons. It is reported to be localized in the ER of cells.