Enables protein tyrosine phosphatase activity. Acts upstream of or within protein dephosphorylation. Predicted to be located in several cellular components, including perikaryon; proximal dendrite; and synaptic vesicle. Is expressed in several structures, including central nervous system; dorsal root ganglion; reproductive system; retina; and submandibular gland. Orthologous to human PTPN5 (protein tyrosine phosphatase non-receptor type 5). [provided by Alliance of Genome Resources, Apr 2022]