1VRO:
reference: Selenium-assisted nucleic acid crystallography: use of phosphoroselenoates for MAD phasing of a DNA structure., Wilds CJ, Pattanayek R, Pan C, Wawrzak Z, Egli M, J Am Chem Soc 2002 Dec 18;124(50):14910-6. PMID: 12475332

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