Putative tyrosine-protein phosphatase required for protection against superoxide stress. Involved in cell-cycle delay in response to linoleic acid hydroperoxide (LoaOOH). H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Present with 2310 molecules/cell in log phase SD medium. Belongs to the protein-tyrosine phosphatase family.