RMSD evolution as a function of time for all the MD simulations: A) HBV-RT/DNA-RNA/dATP with Mg2+-1 only in the active site; B) HBV-RT/DNA-RNA/dATP with two Mg2+ ions in the active site; C) HBV-RT/DNA-RNA/TFV-DP with two Mg2+ ions in the active site. (TIF 2569 kb)