The gene (PTPN13) encoding the protein tyrosine phosphatase PTP-BL/PTP-BAS is located in mouse chromosome region 5E/F and human chromosome region 4q21.

Both mouse and human genomic clones were isolated for protein tyrosine phosphatase PTP-BL/PTP-BAS (HGM approved gene symbols Ptpn13 and PTPN13, respectively). Using these clones as a probe, PTPN13 was assigned to human chromosome region 4q21 and mouse chromosome region 5E/F by fluorescence in situ hybridization (FISH).