Important role in neural and renal epithelial function. a phosphate monoester + H2O = an alcohol + phosphate Binds 1 Mg(2+) ion. Binds 2 Zn(2+) ions. Homodimer. Ellipsoid body ring neurons in the adult brain and in the lower Malpighian tubule and ureter. Highest abundance during larval stage (prior to the secretion of pupal cuticle) and adult stage. Belongs to the alkaline phosphatase family.