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WrbA holoprotein crystals grown by the sitting-drop vapour-diffusion method from reservoirs containing: (a) 25% ethylene glycol (crystal form I), (b) 20% PEG 8000, 0.1 M Tris–HCl pH 8.0 (crystal form II), (c) 30% PEG 4000, 0.1 M Tris–HCl pH 8.5, 0.2 M MgCl2.
