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Colored well shaped three-dimensional crystals of cytochrome c 4 with maximal dimensions of approximately 0.6 × 0.05 × 0.02 mm grown within 3–4 d in the presence of 5 mM CuCl2, 3.2 M (NH4)2SO4 and 0.1 M citric acid pH 5 in the protein drop and 3.2 M (NH4)2SO4, 0.1 M citric acid pH 5 in the reservoir and with the influence of the additives 5 mM CdCl2, 5 mM CoCl2, 5 mM BaCl2 in the other wells (see also §3.1).
