It looks like 6 coordinated metal atom with coordinated (possibly) with waters. The simplest case could be NA. You could use anomalous difference map to see if there is any anomalous signal there.
Regards Garib On 6 Mar 2018, at 22:19, Rajesh Kumar <rajesh.p...@gmail.com> wrote: > Dear All, > > Have you had experience with this kind of density? I am wandering what this > could be? > > Thank you very much for the help. > > -Rajesh > > > <Screen Shot 2018-03-06 at 5.15.20 PM.png> > Dr Garib N Murshudov MRC-LMB Francis Crick Avenue Cambridge CB2 0QH UK Web http://www.mrc-lmb.cam.ac.uk, http://www2.mrc-lmb.cam.ac.uk/groups/murshudov/