Hi David, There are several different ways to toggle the "activation status" of a model, i.e. whether the model can be moved or not. This status can be set separately for each model. Any of these ways can be used: - if you are showing the Command Line (Tools... Favorites... Command Line), the checkboxes next to the model numbers in the "Active models" line can be used to activate/deactivate models. - in the Model Panel (Tools... Favorites... Model Panel), the "Active" checkboxes can be toggled to activate/deactivate models. - the "select" command can be used, as described in http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/select.html You might consider taking a look at the tutorials (Help... Tutorials). Both of the beginner tutorials mention this issue (near the end of the respective tutorial). When you open both of your PDB files, by default the first one you open will be model 0 and the second will be model 1. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. meng@cgl.ucsf.edu UCSF Computer Graphics Lab and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco http://www.cgl.ucsf.edu/home/meng/index.html On Sep 29, 2005, at 2:18 PM, David Chenoweth wrote:

Hi!

I am a new chimera user and was just wondering if someone could tell me how to move a single molecule in chimera when I have two open. I have two separate small molecule pdb files and I want to open both in the same chimera session. I also want to be able to move one independent of the other so I can overlay the two. Once they are overlayed I would also like the option of adjusting either or moving both together. Thanks in advance for the help.

David C.