research papers
Refinement and analysis of four structures with various data resolution cutoffs suggests that at present there are no reliable criteria for judging the diffraction data resolution limit and the condition I/σ(I) = 2.0 is reasonable. However, extending the limit by about 0.2 Å beyond the resolution defined by this threshold does not deteriorate the quality of refined structures and in some cases may be beneficial.
research papers
An ultrahigh-resolution structure of the Z-DNA dodecamer, solved from the anomalous signal of P atoms, reveals substantial flexibility of the backbone phosphate groups.