Before revision:  Earlier versions of the model predicted simple folds such as hairpins and double helices. Important modifications in the force field now allow us to treat a much larger variety of structures thanks to the possibility of one base to form multiple contacts and non-canonical pairings, which are essential for the formation and the stability of structures such as pseudoknots, multiple helices, and the complex architecturesof riboswitches\mus  .
After revision:  Using a reduced set of particles and detailed interactions accounting for base-pairing and stacking we show that non-canonical pairings, which are essential for the formation and the stability of structures such as pseudoknots, multiple helices, and the complex architecturesof riboswitches\mus .