Hi Virginia, I definitely tried it myself before sending the message, but in a much newer version (daily build Jan 9, 2009!). However, I just now tried it in both 1.2540 and the most recent production release 1.3 (Dec 2008), and in both of those versions the command works either with or without the pound signs (#). The error message sounds like you have additional models besides the DNA structure with model number 0. If so, I think the command would work if you close those, use sym, and then reopen or regenerate them as possible. You may want to update to a newer version to get other new features, but my experiments suggest it will not affect this particular problem. Best, Elaine ----- Elaine C. Meng, Ph.D. meng@cgl.ucsf.edu UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco http://www.cgl.ucsf.edu/home/meng/index.html On Jan 12, 2009, at 1:41 PM, Virginia Pett wrote:

Elaine, Thanks for the fast reply!

I had tried what you suggested. sym #0 #0 and just now I tried sym 0 0 and generated error message: Multiple models with id: 0

I am using Chimera ver 1.2540 and perhaps the problem is that I need to update the software?

Virginia