1.1.1.312	from the cell extract of Escherichia coli, using POROS polyethyleneimine anion-exchange chromatography, POROS quaternized PI anion-exchange chromatography and POROS phenylether hydrophobic-interaction chromatography	
1.1.1.312	recombinant enzyme expressed in Escherichia coli	
1.1.1.312	using gel filtration on Sephadex G-200