Here are simple movies for the demonstration of the restrained MD refinement by SAXS_MD. The crystal structure of RNase T1 was used as an initial structure after normal energy minimization. The snapshots of the molecular structure and the SAXS curve calculated from it are updated every 50 steps. Experimental curve is also shown in the plot. (For details, see J. Appl. Crystallogr. 37, 103 (2004)