Possible cell adhesion receptor. It possesses an intrinsic protein tyrosine phosphatase activity (PTPase) (By similarity). The first PTPase domain has enzymatic activity, while the second one seems to affect the substrate specificity of the first one. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Belongs to the protein-tyrosine phosphatase family. Receptor class 2A subfamily.