Putative phosphatase which, together with eak-4 and sdf-9, negatively regulates dauer larva formation downstream of insulin-like receptor daf-2 and in parallel of age-1, pdk-1 and akt-1. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Expressed in the 2 embryonic head hypodermal cells XXXL/R. Moderate increase in constitutive dauer larva formation at 27 degrees Celsius. Increases constitutive dauer larva formation at 25 degrees Celsius in akt-1 mg306, age-1 hx546 or pdk-1 sa709 mutant backgrounds. Normal lifespan. Belongs to the protein-tyrosine phosphatase family. Its phosphatase activity is uncertain. Lacks in vitro phosphatase activity with p-nitrophenylphosphate, even if the catalytic Cys is conserved.