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Re: [ccp4bb]: refinement problem



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Anastassis Perrakis wrote:
> 
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> > My problem is in refining a higher resolution native data set, to 1.9 A.  The
> > data is fairly isomorphous with the MAD data set, P21, a = 43.718 , b = 73.184
> > , c = 47.427 , b = 113.842.
> 
> Before looking at possible twinning problems ( I guess the experts will
> strike soon ) I would also suggest, given the resolution, to feed the
> starting model to ARP/wARP (www.arp-warp.org) and let the 'warpNtrace'
> protcole rebuild it. If that does not work and R/Rfree are still high I
> would start (well ... keep on ...) being worried ;-)
> 
>                         Tassos


 Twinning not possible here - in monoclinic space groups you need  a*+c*
to be about the same length as a* or c* - not the case with this cell.