Anti-lysp100b antibodies enable researchers to detect and measure the lysp100b antigen in biological samples. This target is a reported synonym of the SP100 gene, which encodes SP100 nuclear antigen. This protein is known to function in DNA damage pathways and the regulation of transcription, among other biological roles. The human version of lysp100b has a canonical amino acid length of 879 residues and a protein mass of 100.4 kilodaltons, although 7 isoforms have been identified. It is reported to be localized in the nucleus and cytoplasm of cells and widely expressed in many tissue types.