2JPZ:
reference: Structure of the Hybrid-2 type intramolecular human telomeric G-quadruplex in K+ solution: insights into structure polymorphism of the human telomeric sequence., Dai J, Carver M, Punchihewa C, Jones RA, Yang D, Nucleic Acids Res. 2007;35(15):4927-40. Epub 2007 Jul 10. PMID: 17626043

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