3TWH:
reference: Novel complex MAD phasing and RNase H structural insights using selenium oligonucleotides., Abdur R, Gerlits OO, Gan J, Jiang J, Salon J, Kovalevsky AY, Chumanevich AA, Weber IT, Huang Z, Acta Crystallogr D Biol Crystallogr. 2014 Feb;70(Pt 2):354-61. doi:, 10.1107/S1399004713027922. Epub 2014 Jan 29. PMID: 24531469

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