2KOW:
reference: Giardia Telomeric Sequence d(TAGGG)(4) Forms Two Intramolecular G-Quadruplexes in K(+) Solution: Effect of Loop Length and Sequence on the Folding Topology., Hu L, Lim KW, Bouaziz S, Phan AT, J Am Chem Soc. 2009 Oct 29. PMID: 19874015

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