Acts preferentially on the c-Jun N-terminal kinase (JNK) and p38 MAPKs. Plays an important role in the heavy metal stress response and in axon regeneration by negatively regulating the kgb-1 (JNK-like) and the pmk-1 (p38-type) MAPK signaling pathways. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate May interact with pmk-3. Expressed in the pharynx, intestine, neurons and vulval hypodermal cells. Expressed throughout development. Belongs to the protein-tyrosine phosphatase family. Non-receptor class dual specificity subfamily.