Before revision:  The key features of the model are (1) simulation of sugarrepuckering between C2'-endo and C3'-endo by the use of one nonharmonic potential and one three-particle potential, (2 ) explicit representation of ions in solution around the DNA, (3) implicit solventapproach and (4 ) sequence dependence.
After revision:  The key features of the model are (1) simulation of sugarrepuckering between C2'-endo and C3'-endo by the use of one nonharmonic potential and one three-particle potential, (2 ) explicit representation of ions (in an implicit solvent) and (ii ) sequence dependence.