Anti-Sipar antibodies enable researchers to detect and measure the Sipar antigen in biological samples. This target is a reported synonym of the FAM220A gene, which encodes family with sequence similarity 220 member A. This protein is known to function in the regulation of transcription and protein dephosphorylation, among other biological roles. The human version of Sipar has a canonical amino acid length of 259 residues and a protein mass of 28 kilodaltons. It is reported to be localized in the nucleus of cells.