Hi Andy, if the numbers are different in the different chains, you can also use a command like sel :100-200.a,235-280.b,298.b,112-194.c (residues 100-200 in chain A, residues 235-280 and 298 in chain B, residues 112-194 in chain C) There are examples of command-line specification on the back side of the Quick Ref (PDF file): http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/quickref.pdf and full documentation of command-line specification is here: http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/frameatom_spec.html There are additional ways, more complicated to explain. If you change selection mode to "append" (menu: Select... Selection Mode... append) then selections such as with the "select" command or by dragging in the Sequence tool will be accumulated instead of replacing each other. I recommend changing back to "replace" afterward to avoid later confusion. Also, the selection mode does not apply to selection with the mouse in the graphics window. Best, 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 Jul 21, 2008, at 9:13 AM, Tom Goddard wrote:

Hi Andy,

Use a command like "select :100-200 to select residues 100 through 200 in all chains.

Tom

Anindito Sen wrote:

...

HI Tom I have a 5 separate chains (of the same crystal structure) docked along my filament reconstruction. How do I select and highlight a certain length of amino acids from each and every chain. Problem happens when I try to select a region of the second or 3rd chain, which "deselects" the pervious selection.

Best Andy