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Dear Harm,
In my experience there is no use in modeling 4.5% twinning. It will not change
the refinement and is most likely an artefact. IMHO you have the following
options:
1) refine in P3221 with overlapping alternative conformations. You could also
give the clashing chains an occupancy of 0.5
Thanks for the feedback.
Twinning is found to be 4.5% with phenix.xtriage. I shall model it,
even though I am not so eager to use that option in Refmac.
I cut the N-terminal in one and used modeled it for the other monomer
in P 32, but were not able to refine it better.
The 2-fold symmetry is event