Hi Mehdi, If you mean the information that automatically appears when you put the mouse cursor over the residue, by default it just shows information for the whole surface. If you instead want to see information about individual atoms/residues, here are instructions: "Sometimes one would rather see information for the atoms under a surface than for the surface itself. This can be achieved by making the surface unselectable with the mouse, for example by: 1. selecting the surface, either picking it with the mouse or using the Model Panel 2. opening the Selection Inspector, by choosing Actions... Inspect or clicking the button near the lower right corner of the main Chimera window 3. in that dialog, inspecting Surface and changing selectable with mouse to false Then, an atomspec balloon will report information for the atom under the cursor position, not necessarily the same as the atom giving rise to the surface patch under the cursor position. The atoms must be displayed for their atomspec balloons to appear, but they do not need to be visible; they could be behind opaque surface. However, the surface can be made transparent (with Actions... Surface... transparency or the command surftransparency) to allow viewing the underlying atoms at the same time." These instructions, with hyperlinks, are in the User's Guide: <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/selection.html#pickselect

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 Dec 6, 2008, at 2:47 PM, Mehdi wrote:

I am a new user of chimera, I would like to know how to label the residues in surface representation like the same action for ribbon! It simply works for ribbon but unfortunately I could not get it to work for surface. Mehdi