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Peg2 hybridization to QFS3 results in PNA/DNA heteroquadruplex formation. SPR sensorgrams of Peg2 binding to immobilized QFS3 in 100 mM KCl (left). In 100 mM LiCl, the response is lost, indicating the molecules do not interact in quadruplex-destabilizing conditions (right). [Peg2] = 5, 10, 25, 50, 75, and 100 nM.
