May be directly involved in signal transduction and/or cell cycle regulation. It is necessary for maintaining growth rate or spore germination. Could show both activity toward tyrosine-protein phosphate as well as with serine-protein phosphate. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate By nitrogen starvation. Present with 7570 molecules/cell in log phase SD medium. Belongs to the protein-tyrosine phosphatase family. Non-receptor class dual specificity subfamily.