3.6.1.28 6.5 - and a second optimum at pH 7.8, microsomal enzyme 210010 3.6.1.28 6.5 - membrane-associated enzyme 210006 3.6.1.28 6.5 - membrane-bound enzyme 210019 3.6.1.28 6.8 - wild type enzyme 667797 3.6.1.28 7 - in absence of activating anion, membrane-associated enzyme 210012 3.6.1.28 7 - soluble enzyme 210019 3.6.1.28 7.5 - in presence of activating anion, membrane-associated enzyme 210012 3.6.1.28 7.8 - and a second optimum at pH 6.5, microsomal enzyme 210010 3.6.1.28 8.3 - assay at 687693 3.6.1.28 8.5 - - 655738