title: ESR and crystallization studies on iron-free xanthine oxidase.
mesh_terms: D003460:Crystallization; D003956:Dialysis; D004578:Electron Spin Resonance Spectroscopy; D005182:Flavin-Adenine Dinucleotide; D007501:Iron; D013053:Spectrophotometry; D014969:Xanthine Oxidase / Q000032:analysis*
chemical_list: D005182:Flavin-Adenine Dinucleotide; D007501:Iron; D014969:Xanthine Oxidase