Dear Chimera development team, I am trying to add a simple animation into the morphed trajectory that was developed using two unique conformations (protein and proten-ligand complex). I want the ligand to fly into the binding site (of course ligand is not considered in the morph since it was not a part of a chain), but I guess this could be done. contents of my model panel. ID 0 ligand surface ID 0 conformation A (protein-ligand complex) ID 1 conformation B (protein) ID 2 Morph (400 frames) I am adding the following commands into the perframe box of md movie: # Save bound view. savepos p1 # Move ligand away and save unbound view. move y -10 model #0 ; turn z -30 model #0 center #0 scale 0.2 savepos p2 #fly ligand into the binding site reset p1 100 wait But it's not working the way I want. I just want the ligand to fly slowly into its original position may be within 25-50 frames. Could we execute the commands at a specific frame number? Kindly let me know what would be the correct commands to achieve this effect. Many thanks for your help. Sincerely, Natesh University of Lille