4.3.1.19	-	
4.3.1.19	mutant strain DU-21 with an activator site-deficient enzyme form	
4.3.1.19	partial	
4.3.1.19	recombinant threonine deaminase	
4.3.1.19	using a nickel-nitrilotriacetic acid affinity column	
4.3.1.19	using a Sephadex G-25, a DEAE-cellulose DE52, a HiLoad26/60 Superdex 200 and a HiPrep 16/10 column	
4.3.1.19	using Ni-NTA chromatography	
4.3.1.19	using Ni-NTA resin