Hello, You can select using a radius or "zone" around some central atoms: (1) Select the central atoms. For example, you could select one amino acid by Ctrl-clicking on one of its atoms and then pressing the keyboard up arrow key. Another way to select one amino acid is to show Sequence (under Favorites menu) and choose it from the sequence window. (2) Choose "Select... Zone" from the menu, enter desired radius value, and turn on "Select all atoms/bonds of any residue in selection zone" if you want to select whole residues instead of parts of residues, click OK. (3) then do something to your selection, for example hide everything else by choosing "Actions... Atoms/Bonds... show only" from the menu. That only affects atom/bond display. If you have other stuff like ribbons and surfaces you will need to hide those separately, which can also be done with the Actions menu. Ribbons/surfaces don't have "show only" but you can use "Select... Invert Selection" first and then hide those parts, or "Select... Clear Selection" first to just hide all ribbons/surfaces. You can also select zones with commands. For example, to select residues within 4.5 angstroms of residue 12 in chain A: sel :12.a z<4.5 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 Dec 27, 2009, at 8:21 AM, gytjyb wrote:

I still thank for you! Maybe, I should learn some basic knowlenge! Do you tell me how to hide all parts except for selected animo acid by redias?