3.1.3.56 6.5 7 type II enzyme 646376 3.1.3.56 7 - - 646382 3.1.3.56 7 - assay at 694699 3.1.3.56 7 7.4 assay at 665575 3.1.3.56 7 7.5 - 646372 3.1.3.56 7.2 - assay at 663839, 751120 3.1.3.56 7.4 - assay at 679206, 682680 3.1.3.56 7.5 - type I enzyme 646376 3.1.3.56 8 - - 586935