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Re: [ccp4bb]: twining about P21, C2 or C2221
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> Dear all,
>
> I checked the manual, it seems seldom that twinning
> happens in P21, C2 and C2221 space group, but through
> the truncate and twining check servicer, my data looks
> like pefect-merohedral twinning, <I2>/<I>2 is 1.75. Is
> it possible that twinning happens in this space group?
> My data is one of three space group, I am not sure
> which one is right.
> The cell parameter is
> P21 : 65.37, 275.29, 65.34, 90, 111.29, 90
> C2: 107.88, 74.56, 274.90, 90, 90.08, 90
> C2221: 74.58, 107.90, 274.78, 90, 90, 90.
>
> If they are twinning, what is the twinning operator,
> and should I do something else special?
>
> Thank you all.
>
> xinqi
Dear Xinqi,
yes, twinning can happen in P21. A nice example was illustrated by
Ban et al. (Nature 400, 841-847, 2000). See in particular Figure 6 of
that paper.
Good luck!
Karsten
----------------------
Dr. Karsten Niefind
Institute of Biochemistry
University of Cologne
Zuelpicher Strasse 47
D-50674 Cologne
tel.: +49/221/470-6444 (Secretary: +49/221/470-6440)
fax: +49/221/470-5092
E-mail: Karsten.Niefind@uni-koeln.de
Internet: http://www.uni-koeln.de/math-nat-fak/biochemie/ds/ma/kni/inhalt_englisch.htm