EC 3.1.3.2 
Orthophosphoric-monoester phosphohydrolase (acid optimum). 
Recombinant from E. coli. In 3.2 M ammonium sulphate containing 1 mM MgCl2 and 0.1 mM ZnSO4. 
Specific activity: ~ 17 U/mg (40oC, pH 5.0, 4-Nitrophenyl phosphate). 
Stable at 4oC for > 2 years.