Re: twinning

["Eleanor J. Dodson" <ccp4@ysbl.york.ac.uk>]

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Titia Sixma wrote:
> 
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> I'ld love some answers to the following totally non-ccp4 related, but
> certainly crystallographic question (and yes, I'll make an overview
> afterwards):
> 
> a) What conditions have people succesfully used to overcome twinning in
> crystallization?


 No suggestiions
> 
> b) What MIR structures have been solved using (de)twinned data
> (besides cephalosporin synthase)?
> 
> c) Have any structures been solved by MAD using detwinned data?


 Have solved some by ignoring it - twinning fraction for some crystals
small; prob < 10% and these give decent maps..

> 
> d) Has anybody experience in detwinning pseudomerohedral twinned data?


 Yes - one ofthese P21 things with a* = nc*

Ask if that is interesting

Eleanor