I'm working with a pdb structure that's icosahedral. The surface is tiled with hexamers and pentamers of its single chain. The unit cell contains 4 chains, 3 from a hexamer and 1 from a pentamer. I need to compare the pentamer inter-chain contacts to those in the hexamer, so I immediately thought of Chimera. I can generate a pretty picture of hexamers & pentamers on screen, but what I can't seem to figure out how to do is to save additional coordinates for the other units of the pentamer, analogous to saving additional coordinates when you fill out a unit cell using the "Higher-order Structure" utilities. Thanks for your help! Irene Newhouse Res. Corp. U of Hawaii _________________________________________________________________ Windows 7: Unclutter your desktop. Learn more. http://www.microsoft.com/windows/windows-7/videos-tours.aspx?h=7sec&slideid=...