Fri. Sept 3rd 2010 EBI Try ProFit ttp://www.bioinf.org.uk/software/profit/ as you can give the atom names you want to fit. Miri On Fri, 3 Sep 2010, Rex Palmer wrote: > This is not really protein crystallography but we are trying to model build a ligand into a protein binding site. A > similar ligand is already in place and we want to replace this by initially superimposing a phenyl ring which is > common to both ligands. We understand that such superpositioning can be done with eg Quanta but do not have access to > this program. Does anyone know of a downloadable program that we could use instead? > > Rex Palmer > Birkbeck College, London > >