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Emerald Biosystems crystallization plate (JenaBioscience, Germany) used to perform the cross-crystallization procedure. Drop wells a, b, c and d were each filled with 0.5 µl of various 5 mM chloride salts (see text) and 0.5 µl precipitant. Protein at a concentration of 15 mg ml−1 (1 µl) was only added into drop well d, containing 5 mM CuCl2.
