Enables phosphoprotein binding activity and protein tyrosine phosphatase activity. Involved in regulation of osteoclast differentiation. Acts upstream of or within several processes, including collagen-activated tyrosine kinase receptor signaling pathway; negative regulation of bone resorption; and platelet aggregation. Predicted to be located in nucleus. Predicted to be active in cytoplasm. Is expressed in several structures, including central nervous system; incisor; limb; nasal cavity epithelium; and retina. Orthologous to human UBASH3B (ubiquitin associated and SH3 domain containing B). [provided by Alliance of Genome Resources, Apr 2022]