Protein tyrosine phosphatase which may play a role in the regulation of lymphangiogenesis, cell-cell adhesion, cell-matrix adhesion, cell migration, cell growth and also regulates TGF-beta gene expression, thereby modulating epithelial-mesenchymal transition. Mediates beta-catenin dephosphorylation at adhesion junctions. Acts as a negative regulator of the oncogenic property of YAP, a downstream target of the hippo pathway, in a cell density-dependent manner. May function as a tumor suppressor. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Interacts with FLT4; the interaction is enhanced by stimulation with VEGFC. Interacts (via PPxY motifs) with YAP1 (via WW domains); this interaction leads to the cytoplasmic sequestration of YAP1 and inhibits its transcriptional coactivator activity. Translocation into the nucleus is associated with induction of cell proliferation. Partially colocalized with actin filaments at the plasma membrane. Thymus; in cells of both hematopoietic and non-hematopoietic origins. Ubiquitinated by the ECS (Elongin BC-CUL2/5-SOCS-box protein)/LRR1 E3 ligase complex and subsequently targeted to proteasomal degradation. PTPN14 deficient mice have swelling of the limbs or periorbital edema. These mice also show hyperplasia of lymphatic capillaries of the ears. There is no evidence of choanal atresia or any overtly dysmorphic features. Belongs to the protein-tyrosine phosphatase family. Non-receptor class subfamily.