May dephosphorylate receptor tyrosine-protein kinase ERBB4 and inhibits its ligand-induced proteolytic cleavage. May play a role in odontogenesis. a phosphate monoester + H2O = an alcohol + phosphate Homodimer. In the developing tooth from 8-day-old mice it is expressed in secretory-stage ameloblasts, follicular cells, odontoblasts, and osteoblasts (at protein level). Glycosylated. Belongs to the histidine acid phosphatase family.