4.2.1.33	-	5658, 5659, 5660, 5663, 726596	
4.2.1.33	nickel-affinity column chromatography and Superdex 200 gel filtration	729127	
4.2.1.33	variants LeuD-1-156 and LeuD-1-168, by centrifugation, on Ni-NTA column and by gel filtration, more than 95% pure	701510