1.3.99.4	in complex with the reaction product 1,4-androstadiene-3,17-dione, to 2.3 A resolution. Key active site residues are Tyr119, Tyr318, Tyr487, and Gly491	
1.3.99.4	sitting drop vapour diffusion method, mixing of 15 mg/ml protein in 25 mM bicine, pH 9.0, 100 mM NaCl, 10% v/v glycerol with 2% v/v PEG 400, 0.1 M, HEPES, pH 7.5, 2.0 M ammonium sulfate, 20°C, 5-7 days, method optimization, X-ray diffraction structure determination and analysis at 2.0 A resolution, multiwavelength anomalous dispersion analysis