Tyrosine-protein phosphatase which dephosphorylates CTNNB1. Regulates CTNNB1 function both in cell adhesion and signaling. May function in cell proliferation and migration and play a role in the maintenance of epithelial integrity. May play a role in megakaryocytopoiesis. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Forms homooligomeric complexes which mediate cell homotypic adhesion (Probable). Interacts (via the cytoplasmic juxtamembrane domain) with CTNNB1; may mediate interaction with the cadherin/catenin adhesion complex. Interacts with KIT. May interact with AP3B1. High levels in brain, pancreas, and skeletal muscle; less in colon, kidney, liver, stomach, and uterus; not expressed in placenta and spleen. Also detected in heart, prostate, lung, thymus, testis and ovary. Ubiquitously expressed in brain. Expressed by hematopoietic stem cells. Expressed in fetal brain, lung and kidney. Up-regulated upon cell contact (at protein level). Down-regulated by phorbol ester (at protein level) and calcium ionophore but up-regulated by phorbol ester in megakaryocytic cells (PubMed:10397721). The extracellular domain is proteolytically processed through cleavage within the fibronectin type-III 4 domain (By similarity). In addition to the 190 kDa full-length protein, proteolytic products of 100 kDa, 80 kDa and 73 kDa are observed. N-glycosylated. Phosphorylated on tyrosine residues upon activation of KIT with stem cell factor (SCF). The 73 kDa proteolytic product is not phosphorylated. Belongs to the protein-tyrosine phosphatase family. Receptor class 2B subfamily. Several sequencing problems. Several sequencing problems.