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While scripting up a keybinding to toggle fixed atoms (via mark_atom_as_fixed()), I discovered that closest_atom (and also active_residue) does not actually return the closest atom for an amino acid, but actually the CA. This seems to be semi-hard coded in the definition in molecule-class-info.cc. That function actually takes a bool ca_check_flag parameter, but the python and scheme wrappers just set the flag to True. // Now, does this at belong to a residue that has a CA? If // it does, reset at_best to be the CA of the residue, but // keep dist_best as it was, of course. Was this a "recent" change? I used to have a keybinding for deleting individual atoms, and would use it for deleting amide hydrogens while adding alternate conformations. (Necessary because of how phenix.refine handles alt-confs). I'm using the fink installation on OS X, and recently updated it for the first time in possibly months. Version 0.7.1-pre Revision 4549. Is there another way to do this, or some work around? I suppose I could call residue_info and compare all the atom coordinates to rotation_centre(). Thanks, Alexander D. Scouras Postdoctoral Fellow Alber Lab University of California, Berkeley