Anti-BOS3 antibodies enable researchers to detect and measure the BOS3 antigen in biological samples. This target is a reported synonym of the SIX1 gene, which encodes SIX homeobox 1. This protein is known to function in the apoptotic pathway and epithelial cell differentiation, among other biological roles. The human version of BOS3 has a canonical amino acid length of 284 residues and a protein mass of 32.2 kilodaltons. It is reported to be localized in the nucleus and cytoplasm of cells and notably expressed in many tissues, such as the cervix and salivary gland. BOS3 is a member of the SIX/Sine oculis homeobox protein family.