1.14.11.27 purified recombinant KDM4C, sitting drop vapor diffusion method, mixing of 7 mg/ml protein with 2 mM N-oxalylglycine with well solution, containing 25% v/v PEG 3350, 0.2 M sodium nitrate, 0.1 M Bis tris propane, pH 6.5, 5% v/v ethylene glycol, 0.01 M NiCl2, in a 2:1 ratio, 4°C, X-ray diffraction structure determination and analysis at 2.55 A resolution 725450