6.2.1.13 6 - forward reaction 744414 6.2.1.13 6.5 - - 660834 6.2.1.13 6.5 - assay at 693061 6.2.1.13 6.5 - assay at, both reaction directions 693061 6.2.1.13 7 - - 625 6.2.1.13 7 - reverse reaction 744414 6.2.1.13 7.2 - - 624 6.2.1.13 7.2 - assay at 744177 6.2.1.13 7.5 - - 660834, 727557 6.2.1.13 7.5 8 - 663376