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. {ECO:0000269|PubMed:10397721, ECO:0000269|PubMed:12501215, ECO:0000269|PubMed:16574648}. This is the function of PTPRU (protein tyrosine phosphatase receptor type U, Ensembl gene identifier ENSG00000060656).