Anti-Williams-Beuren syndrome chromosome region 16 antibodies enable researchers to detect and measure the Williams-Beuren syndrome chromosome region 16 antigen in biological samples. This target is a reported synonym of the RCC1L gene, which encodes RCC1 like. The human version of Williams-Beuren syndrome chromosome region 16 has a canonical amino acid length of 464 residues and a protein mass of 49.9 kilodaltons, although 3 isoforms have been identified. It is reported to be localized in the mitochondria of cells and widely expressed in many tissue types. Other names for this target antigen include RCC1-like G exchanging factor-like protein, Williams-Beuren syndrome chromosomal region 16 protein, and Williams-Beuren syndrome chromosome region 16.