The fourfold mutant AQUIx 4 (H119 A/R 120S/R 121G/A 123S) showed no significant difference in either catalytic property or stability when compared to the wild type enzyme.
Fjórfölda stökkbreytingin AQUIx 4 (H119 A/R 120S/R 121G/A 123S) sýndi ennfremur litla breytingu í eiginleikum miðað við ensím villigerðarinnar.