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I have a structure that I am trying to finish off, I have Zn ligated by four cys residues. I use the linkR and define distances (the same link for each ZnS bond) My issue is how to stop the structure moving to a square pyramid (consistent with distance restraints) rather than a tetrahedral geometry. Can anyone help? best Jim Jim Naismith BSRC, North Haugh [log in to unmask] Google scholar is free and tracks your outputs, mine are http://scholar.google.co.uk/citations?hl=en&user=fLmKKQMAAAAJ ResearcherID H-3408-2012; SCOPUS_ID 7005691850 http://www.researchgate.net/profile/James_Naismith/ The University of St Andrews is a charity registered in Scotland : No SC013532k