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Hello Mikaela--

> 
> I am doing structure refinement with refine.py in xplor on a protein that
> contains two Zn atoms.  My input structure (crystal structure of a similar
> protein) has the Zn atoms in the pdb but the XPLOR output pdb files don't
> contain Zn and the regions that should be coordinated to zinc are taking on
> incorrect features.  What is the proper method to get xplor to take the Zn
> into account?  Thank you for your help with this.

Usually, one needs to generate a patch to add the Zn atoms, bonds and
angles, although it's also possible to use distance restraints to
represent bonds. Do you know the geometry of your zinc centers?

Charles
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