1BQJ:
reference: Stabilization of the i-motif by intramolecular adenine-adenine-thymine base triple in the structure of d(ACCCT)., Weil J, Min T, Yang C, Wang S, Sutherland C, Sinha N, Kang C, Acta Crystallogr D Biol Crystallogr 1999 Feb;55 ( Pt 2):422-9. PMID: 10089350

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