May play a role in the regulation of oligodendrocyte differentiation. May play a role in the regulation of myelin formation (PubMed:27532821). Involved in the regulation of Erk1/2 phosphorylation in Schwann cells; the signaling may be linked to the regulation of myelination (PubMed:27891578). May dephosphorylate MAPK13, ATF2, ERBB3, PDGFRB and SNX6 (By similarity). H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate H2O + O-phospho-L-seryl-[protein] = L-seryl-[protein] + phosphate H2O + O-phospho-L-threonyl-[protein] = L-threonyl-[protein] + phosphate Expression increases during oligodendrocyte differentiation. Belongs to the protein-tyrosine phosphatase family. Non-receptor class dual specificity subfamily.