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Hello Hongyan--

> When I lowered the force constants for the metal-cluster relevent bonds and
> angles, there wrill be more violations upon generating PSF files. I think
> perhaps that it is better to incoporate metal-cluster constraints via H-bond 
> as
> I did in Cyana. We have got all the constraint files for metal cluster but
> don't know how to do it in xplor-NIH. Could you please do me a favor?

You could use NOE distance restraints. If you do this, remove the
appropriate bonds (and angles) from the topology presidue statement.

best regards--
Charles
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