Tyrosine protein phosphatase which may function as a dosage-dependent inducer in mitotic control. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Present at all developmental stages (at protein level). Phosphorylated. Belongs to the MPI phosphatase family. The protein might be post-translationally truncated or the gene model could be wrong, because experimentally the protein migrates like a 56 kDa protein wereas it should migrate around 117 kDa.