1GWD:
reference: Triiodide derivatization and combinatorial counter-ion replacement: two methods for enhancing phasing signal using laboratory Cu Kalpha X-ray equipment., Evans G, Bricogne G, Acta Crystallogr D Biol Crystallogr 2002 Jun;58(Pt 6 Pt 2):976-91. PMID: 12037300

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