Dear Simon, low B factors might indicate a higher number of electrons, i.e. an atom larger than oxygen, like for example a metal cation (calcium etc.) of an anion (chloride etc.). Take a look at the environment arounf the "strange" solvent molecule.
Oliviero On Thu, December 13, 2007 22:36, Yue Li wrote: > Hi all, > > When I refined one of my structures in refmac and cns, I found some water > molecules having low B factor (i.e < 10). Should I omit these water > molecules from the structure ? The overall B factor is 35.3 > > Thanks > > Simon > >