Representative conformations of HJH in different [KCl] regimes: low (30 mM), medium (100 mM), and high (500 mM). The dominant conformation is shown in red, whereas other competing conformations are shown in transparent cyan, based on the detected frequencies in the ensemble. The junction conformations are shown on the right (C12-UUUUU-C18), with a label reflecting the percentage observed. This figure was generated by PyMOL (Schrödinger LLC, New York, NY) using home-written Python scripts. To see this figure in color, go online.