Figure 3

CD titration spectra of the human telomeric G-quadruplexes (3.0 μM) induced by the three compounds (from left to right: dptmp, 1 and 2) in 10 mM Tris-HCl, pH 7.4, at room temperature (r = CML/CDNA).
a: In the absence of metal ions; b: In 100 mM NaCl; c: In 100 mM KCl.