Hello John, The image you sent shows that you opened 2bbv.pdb (PDB format). The mmCIF symmetry information is only present for the structure when it is opened from mmCIF format, e.g., using the command in the Quick Start Guide:

open 2bbv

So the "sym #1" command did execute properly, it is just that there is no symmetry information associated with #1 when it is opened from a PDB format file instead of mmCIF format. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

P.S. you can just attach image files such as screenshots directly, you do not need to put them inside a word document

On Aug 18, 2022, at 6:26 PM, John O'Brien via ChimeraX-users chimerax-users@cgl.ucsf.edu wrote:

Hello, I am a new user to ChimeraX, and was doing the examples in the Quick Start Guide as practice. While following the Atomic Structure Commands, the "sym #1" command did not appear to produce the full table of symmetries, as described in the guide. Could you please help me with this? I have attached a screenshot of what I see to this email, hopefully that helps. Best, John O'Brien <2bbv practice.docx>