Protein tyrosine phosphatase which stimulates progression from G1 into S phase during mitosis. May play a role in the development and maintenance of differentiating epithelial tissues (By similarity). H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Inhibited by sodium orthovanadate and pentamidine. Homotrimer. Interacts with ATF5 and tubulin (By similarity). And mitotic spindle. In the retina, expressed by red/green- but not blue-sensitive cone photoreceptor cells, and by rod bipolar cells (at protein level). Farnesylated. Farnesylation is required for membrane targeting (By similarity). Belongs to the protein-tyrosine phosphatase family.