1S45:
reference: A thymine tetrad in d(TGGGGT) quadruplexes stabilized with Tl+/Na+ ions., Caceres C, Wright G, Gouyette C, Parkinson G, Subirana JA, Nucleic Acids Res 2004 Feb 11;32(3):1097-102. Print 2004. PMID: 14960719

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