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Recombinant human interleukin 2 produced by Escherichia coli was purified to homogeneity and crystallized after being separated from methionyl interleukin 2. Crystals suitable for structural studies have been obtained by the seed enlargement technique, using the method of vapor diffusion with ammonium sulfate as the precipitant at pH 4.6. The space group is P2(1)2(1)2 with cell dimensions a = 49.2 A, b = 87.6 A and c = 32.4 A. The asymmetric unit contains one molecule of the protein. From preliminary results, the crystals are moderately stable to X-rays and produce measurable reflections to a resolution of about 2.2 A. The diffraction data for the native crystals have been collected on a diffractometer at 2.4 A resolution.
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