Hi Sujata, Sorry, you can't build all-atom models from alpha-carbon models using Chimera. Some Web servers can do it, for example, Maxsprout: <http://www.ebi.ac.uk/Tools/maxsprout/index.html> There are probably several others... that's just one I've used in the past. Best, 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 Nov 23, 2010, at 11:52 AM, Sujata wrote:

Hi, I have a PDB file with C-alpha carbons only. I want to know if Chimera can add backbone atoms and sidechains (the PDB has the names of the residues). Thanks, Sujata