3.1.3.60 5.6 - - 3.1.3.60 5.6 - assay at pH 7.5 in Tris-HCl, or at pH 5.6 in sodium acetate 3.1.3.60 7 - - 3.1.3.60 7.5 - assay at pH 7.5 in Tris-HCl, or at pH 5.6 in sodium acetate 3.1.3.60 8.5 - -