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(A) A G-quartet (left) and a possible conformation of an intramolecular quadruplex formed by the human G-rich telomeric repeat (right). (B) Sequence of the oligonucleotides used in this study. Runs of G are indicated in bold characters; fluo, 5′-fluorescein; tamra, 3′-tetramethylrhodamine; 7, 7-deazaG base analog. (C) Chemical formula of the tested G4 ligands.
