Hello all, I'm trying to execute the script to fill out the crystal unit cell found here: http://www.cgl.ucsf.edu/chimera/docs/ProgrammersGuide/faq.html#q13 However, I get the error that UnitCell does not have the 'molecule_center' attribute (code line ~12). I checked with dir(), and yeah, it's not there: ['ModelessDialog', 'Unit_Cell_Dialog', '__builtins__', '__doc__', '__file__', '__name__', '__package__', '__path__', 'chimera', 'dialogs', 'find_model_by_name', 'outline_box', 'place_molecule_copies', 'remove_extra_copies', 'show_unit_cell_dialog'] Where did the attribute go? Is there some other module I could use? Could someone explain (or direct me to some webpage that explains) the process of expanding the ASU and I can write my own script. Any help is greatly appreciated! Thanks! Alex