Anti-KF1 antibodies enable researchers to detect and measure the KF1 antigen in biological samples. This target is a reported synonym of the RNF103 gene, which encodes ring finger protein 103. This protein is known to function in nervous system development and protein ubiquitination, among other biological roles. The human version of KF1 has a canonical amino acid length of 685 residues and a protein mass of 79.4 kilodaltons. It is reported to be localized in the ER of cells and notably expressed in many tissues, such as the breast and colon. Other names for this target antigen include HKF-1, HKF-1, and KF-1.