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The atom selection you want is probably: [ZN] (Yes, this is a work-around until this is properly handled.) Paul On Tue, Jul 17, 2007 at 11:26:19AM +0100, Roberto Steiner wrote: > Ciao Luca, > > you can mask the Zn density using the function "Mask molecule by atom > selection" > available in the Extesions Menu. > > Roberto > > > Quoting Luca Pellegrini <[log in to unmask]>: > > >Hi, > > > >We're trying to model a Zn-binding loop at 2.5A, and when we do Real Space > >Refine Zone, Coot keeps pulling the Cys side chains into the density blob > >of the zinc. Is there a way to set up a S-Zn distance restraint? > > > >thanks, > > > >Luca > > >