[phenixbb] twinning question

Terwilliger, Thomas C terwilliger at lanl.gov
Thu Apr 19 10:59:00 PDT 2012

Hi Pat,
As Ralf says, P6 or P1.  I think if the data merges well in both P622 and P6 then you are going to get very similar twinning statistics in the two space groups.  This would not be true if the data merged poorly in P622; in that case merging to P622 it would make it look twinned.
All the best,
Tom T

From: phenixbb-bounces at phenix-online.org [phenixbb-bounces at phenix-online.org] on behalf of Patrick Loll [pat.loll at drexel.edu]
Sent: Thursday, April 19, 2012 10:45 AM
To: PHENIX user mailing list
Subject: [phenixbb] twinning question

Dumb question here: When one runs the various twinning tests (e.g. phenix.xtriage), is one meant to use data processed in the higher symmetry SG, or the lower symmetry SG?

A concrete example: I can process a data set in a 622 point group w/ reasonable merging statistics, but an abnormally low solvent content raises my suspicions. So do I process as P6, and submit these data to the twinning test? Or do I submit the data processed as P622?


Patrick J. Loll, Ph. D.
Professor of Biochemistry & Molecular Biology
Director, Biochemistry Graduate Program
Drexel University College of Medicine
Room 10-102 New College Building
245 N. 15th St., Mailstop 497
Philadelphia, PA  19102-1192  USA

(215) 762-7706
pat.loll at drexelmed.edu

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