3.5.3.4 - 3.5.3.4 in complex with allantoate, sitting drop vapor diffusion method, using 0.1 M sodium citrate (pH 5.6), 20% (w/v) polyethylene glycol 4000, 20%(v/v) isopropanol, 1 mMMnCl2, and 5 mM allantoate 3.5.3.4 nanodroplet vapor diffusion method 3.5.3.4 Se-Met-labeled protein crystals grown from a mixture in a 1:1.5 ratio of 8 mg/ml protein solution and a reservoir solution of 7% PEG8000, 12% PEG400, and 100 mM HEPES, pH 7.5