3V9D:
reference: Structure of the tetradecanucleotide d(CCCCGGTACCGGGG)2 as an A-DNA duplex., Mandal PK, Venkadesh S, Gautham N, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2012 Apr 1;68(Pt 4):393-9. Epub, 2012 Mar 27. PMID: 22505405

This OCA Structure page
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