1I4U:
reference: The C1 subunit of alpha-crustacyanin: the de novo phasing of the crystal structure of a 40 kDa homodimeric protein using the anomalous scattering from S atoms combined with direct methods., Gordon EJ, Leonard GA, McSweeney S, Zagalsky PF, Acta Crystallogr D Biol Crystallogr 2001 Sep;57(Pt 9):1230-7. PMID: 11526314

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