2.1.1.158 purified recombinant wild-type and selenomethionine-labeled XMT, 23-28% PEG 3350, 0.2 M LiCl, 0.1 M Tris-HCl, pH 8.5-8.7, 2 mM DTT, 1 mM S-adenosyl-L-cysteine, and 1 mM xanthosine, 1-3 days, 20°C, X-ray diffraction structure determination and analysis at 2.8-3.0 A resolution 667101 2.1.1.158 purified recombinant wild-type and selenomethionine-labeled XMT, 23-28% PEG 3350, 0.2 M LiCl, 0.1 M Tris-HCl, pH 8.5-8.7, 2 mM DTT, 2 mM S-adenosyl-L-cysteine, and 2 mM xanthosine, 1-3 days, 20°C, plate-like crystals, X-ray diffraction structure determination and analysis at 2.2 A resolution 670598 2.1.1.158 using Linbro plates and the conventional hanging-drop technique, in the presence of the demethylated cofactor S-adenosyl-l-cysteine or xanthosine 684218