Hi, Let's say I load 4 molecules, A, B, C, & D. A and B are a heterodimer pair, as are C and D. I'd like to move/rotate A and B together, maintaining their respective orientations, while holding C and D fixed (e.g., manually overlaying dimer structures). How do I do this? I might have hit on the appropriate combination of protecting/freezing/creating objects/etc. once, but can't seem to repeat the routine. Thanks for any tips, David Horita ----------------------------- David A. Horita, Ph.D. Department of Biochemistry Wake Forest University School of Medicine Winston-Salem, NC 27157-1016 Tel: 336 713-4194 Fax: 336 716-7671 email: dhor...@wfubmc.edu web: http://www.wfubmc.edu/biochem/faculty/Horita/