Can someone please tell me how to align a selected subset of atoms in two PDB file models that contain only alpha carbon atoms? Normally I do structural alignments in DeepView, but it seems to reject alpha-carbon-only models. Is there free software for Windows (or a server) that can align alpha-carbon only models? Or will someone kindly volunteer to do a single alignment for me? Thanks, -Eric ---- Eric Martz, Professor Emeritus, Dept Microbiology University of Massachusetts, Amherst MA US http://www.umass.edu/molvis/martz