May have a role in growth and in the early stages of development. Affects the timing of development. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Might be tethered to the plasma membrane. Expressed predominantly in anterior-like cells and to a lesser degree in prestalk cells. Expressed at a very low level in vegetative cells, induced by 4 hours, maximally expressed at the tight aggregate stage and through the remainder of development. The PTPase domain is interrupted by a PTPase insert which shares no homologies with other PTPase proteins. Belongs to the protein-tyrosine phosphatase family. Non-receptor class subfamily. The gene for this protein is duplicated in strains AX3 and AX4. These strains contain a duplication of a segment of 750 kb of chromosome 2 compared to the corresponding sequence in strain AX2.