5.1.3.14 7 9 - 2265, 2268 5.1.3.14 7.1 - and a second optimum at pH 7.9 2259 5.1.3.14 7.5 - assay at 703905 5.1.3.14 7.5 8 - 2264 5.1.3.14 7.7 - - 2257 5.1.3.14 7.9 - and a second optimum at pH 7.1 2259 5.1.3.14 8 - assay at 755205 5.1.3.14 8 8.5 - 2261, 2267 5.1.3.14 8 9 - 747462 5.1.3.14 8 9 recombinant enzyme 747462