1.14.20.7 analysis of crystal structure of the enzyme in complex with several ligands, detailed overview 1.14.20.7 in complex with manganese and 2-oxoglutarate, with manganese and the buffer bis-Tris-propane, and in complex with iron, L-Arg, and N-oxalylglycine, sitting drop vapor diffusion method, using 17.5-25% (w/v) polyethylene glycol (PEG) 3350 and 6000