1.14.13.128	native heteroxanthine demethylase partially	
1.14.13.128	Ni-NTA column chromatography	
1.14.13.128	Ni-NTA column chromatography and Sephacryl S200 gel filtration	
1.14.13.128	partial	
1.14.13.128	purification of two-subunit N-demethylase component (Ndm) of the N-demethylase holoenzyme	
1.14.13.128	recombinant His-tagged wild-type and mutant NdmC proteins by nickel affinity chromatography and gel filtration