research papers
A 16 Å resolution molecular envelope of Na+-translocating NADH:ubiquinone oxidoreductase was determined by connectivity-based ab initio phasing. The low-resolution structure of this multi-subunit membrane complex was confirmed by negative-stain electron microscopy.
short communications
The distribution of twinned intensities may be biased towards the Wilson distribution if a noncrystallographic screw axis parallel to the twinning axis is present.
research papers
The values of atomic shifts in unrestrained refinement can hint at alternative conformations.