Possible cell adhesion receptor. It possesses an intrinsic protein tyrosine phosphatase activity (PTPase) and dephosphorylates EPHA2 regulating its activity (By similarity). H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Interacts with GRIP1. Interacts with PPFIA1, PPFIA2 and PPFIA3. Interacts with PTPRF. Expressed in the cell of the T lineage but not in cells of any other hemopoietic lineage. The first PTPase domain has enzymatic activity, while the second one seems to affect the substrate specificity of the first one. Belongs to the protein-tyrosine phosphatase family. Receptor class 2A subfamily.