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Dear Veronica,
just a comment, you can refine as well against twinned data using CNS.
The problem is that with a twinning fraction very close to 50 % and at
quite low resolution, calculated maps are completely biased towards the
model used in MR and it is almost impossible to correct it. A better
approach may be to screen for data with lower twinning fractions, for
example using only a tip of the crystal or a very small microfocus beam
as available at some synchrotrons (ESRF, ID23-2 or at the SLS).
Yours
Wim Burmeister
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Wim Burmeister
Professeur, Membre de l'Institut Universitaire de France
Laboratoire de Virologie Moleculaire et Structurale FRE 2854 CNRS-UJF
c/o EMBL, 6 rue Jules Horowitz
B.P. 181, F-38042 Grenoble Cedex 9 FRANCE
E-mail: [EMAIL PROTECTED]
Tel: +33 (0) 476 20 72 82 Fax: +33 (0) 476 20 94 00
http://www2.ujf-grenoble.fr/pharmacie/laboratoires/gdrviro
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