Hi Vijyay,

Did you tried with P212121 system?. RCSB has one structure with similar
unitcell and the corresponding pdb code is 3BMA. If you have not tried then
I hope it will solve the problem.

Thanks
damo

On Thu, Nov 29, 2018 at 11:44 AM Vijay Jayaraman <
bkvijay.jayara...@gmail.com> wrote:

> Hi all,
> The data that we collected recently is in space group C 2 2 21 and appears
> to be twinned. I could not find a twin law which I can use to detwin the
> data. The R and R free doesn't drop below 0.4 even after multiple rounds of
> manual and automated refinement.  I have also attached the self-rotation
> function output as a pdf file here. Kindly suggest a solution. Useful
> details are here:
>
> Space group C 2 2 21
> Unit cell:    92.24  148.78  206.60      90.00   90.00   90.00
> Maximum resolution: 2.6 Angstrom
>
> This is the warning message from the AIMLESS log file:
>
> "WARNING: the L-test suggests that the data may be twinned,
>    so the indicated Laue symmetry may be too high
>    Rough estimated twin fraction alpha from cumulative N(|L|) plot 0.151
> +/-(0.020)
>    Rough estimated twin fraction alpha from     0.141
>    Rough estimated twin fraction alpha from     0.128"
>
> Thanks.
>
>
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