[phenixbb] twinning detection

Ursula Schulze-Gahmen uschulze-gahmen at lbl.gov
Mon Jun 6 13:47:15 PDT 2016

I have an extremely low resolution data set to 6.5 A.  The data were
collected on a Pilatus detector, indexed and further processed in XDS,
space group P321.  Pointless determines spacegroup to P3221 or P3121 and
L-test shows no twinning. Phenix X-triage indicates twinning, but the twin
fraction varies enormously depending on the method used: Britton analysis
0.337, H-test 0.260, ML 0.022. The UCLA twin server also thinks that data
are twinned. How do I evaluate which information is right?

Also, I think I found a molecular replacement solution that is correct
using these twinned data.


Ursula Schulze-Gahmen, Ph.D.
Project Scientist
UC Berkeley, QB3
360 Stanley Hall #3220
Berkeley, CA 94720-3220
(510) 643 9491
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