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 co-activator activity. Translocation into the nucleus is associated with induction of cell proliferation. Partially colocalized with actin filaments at the plasma membrane. Ubiquitous. Up-regulated at protein level by cell density. However, at the mRNA level remains the same regardless of the status of cell density. Ubiquitinated by the ECS (Elongin BC-CUL2/5-SOCS-box protein)/LRR1 E3 ligase complex and subsequently targeted to proteasomal degradation. The disease is caused by variants affecting the gene represented in this entry. A homozygous deletion in PTPN14 predicted to result in frameshift and premature truncation, has been shown to be the cause of choanal atresia and lymphedema in one family. Influence clinical severity of hereditary haemorragic telagiectasia (HHT). Belongs to the protein-tyrosine phosphatase family. Non-receptor class subfamily.