[phenixbb] Twinning

Shun Liu sliu.xtal at gmail.com
Mon Mar 30 22:12:29 PDT 2015

Dear all,
Recently I have got a data set that diffracts to 1.7 angstrom. Images look good. During data processing I did not find anything that looks strange. However, when I was doing Phaser-MR, I got a  warning: “ Intensity moments suggest significant twinning (>5%). Tests based on possible twin laws will be more definitive.” What does this mean? A twin data set? I still found a solution and refined the model step by step, using the data (20-1.7 angstrom). It seems that the final model and map are acceptable. But R-factors are 0.24/0.28, a little high. Does the twin cause the high R-factors? Is there a solution to detwin? Or are the R-factors acceptable for a twin data set? Any suggestions are appreciated and thanks in advance!



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