NCS ??

[Xavier Gomis Rueth]

I am trying to refine a twinned DNA structure with two alternative strands of
different sequence and occupancy 0.5. I 'd like to constrain "ncs-like" the
backbones of both molecules, but it fails as the sequence is not
the same nor the number/types of atoms. Any ideas to overcome this ?

Thanks a lot in advance,

Xavier
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