Hi Corey, For your example you could use the command-line selector :.a & strand - or - :.a & :/isStrand - or - :.a & :/isSheet where "&" means an intersection. If you have other models, you would use #0:.a for model 0, chain A instead of just the :.a for all chains A. If you will be referring to this set of atoms frequently in the command line, an alias may be more convenient, for example: alias sheeta :.a & strand alias sheetb :.b & strand color red sheeta color dodger blue sheetb <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/frameatom_spec.html> <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/atom_spec.html#combina...> I hope this helps! Elaine ---------- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco On Apr 20, 2011, at 8:00 PM, Corey Fugate wrote:

For example, I have model #0 with chains A and B, how do I select the beta-sheets in chain A? I tried :.A:/isSheet and that selects all of chain A, not just the sheets.

Corey

On Apr 20, 2011, at 4:31 PM, Corey Fugate wrote:

...

I'm having a hard time figuring out how to select secondary structural elements from the command line.

Can someone help me with this?

Corey