Anti-nPTB antibodies enable researchers to detect and measure the nPTB antigen in biological samples. This target is a reported synonym of the PTBP2 gene, which encodes polypyrimidine tract binding protein 2. This protein is known to function in brain development, among other biological roles. The human version of nPTB has a canonical amino acid length of 531 residues and a protein mass of 57.5 kilodaltons, although 6 isoforms have been identified. It is reported to be localized in the nucleus of cells.