Anti-CFAP21 antibodies enable researchers to detect and measure the CFAP21 antigen in biological samples. This target is a reported synonym of the EFHB gene, which encodes EF-hand domain family member B. This protein is known to function in the transport of ions, among other biological roles. The human version of CFAP21 has a canonical amino acid length of 833 residues and a protein mass of 93.8 kilodaltons, although 3 isoforms have been identified. It is reported to be localized in the cytoplasm of cells.