Could be rad dam? See http://dx.doi.org/10.1107/S0907444905022316
But also be careful which map you are looking at. Some phasing programs
will output map coefficients with the heavy atom contribution
subtracted. For your convenience.
This is perhaps an excellent example of why you should always mention
which programs you are using. I don't think there is a single step in
solving a structure that doesn't have at least two different programs to
choose from.
-James Holton
MAD Scientist
On 8/30/2015 8:11 AM, Faisal Tarique wrote:
> Hello everyone
>
> I soaked my crystal with HgCl2 and solved the crystal structure
> through MRSAD phasing. During processing one could see a strong
> anomalous signal at Hg edge, and the structure was solved with a very
> good electron density and refinement statistics. But the problem is
> that I am not able to locate Hg atom in the electron density map. My
> question is.. If the structure was solved using anomalous diffraction
> from Hg then it should be seen somewhere near the structure. Is this a
> normal phenomenon or there is indeed some problem with the map.??
>
> --
> Regards
>
> Faisal
> School of Life Sciences
> JNU
>
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