Long Wavelength MX, Diamond Light Source, Harwell, UK
The long-wavelength macromolecular crystallography beamline I23 is a unique facility for solving the crystallographic phase problem, using the small anomalous signals from sulphur or phosphorus which are present in native protein or RNA/DNA crystals. The unique wavelength range also allows identification and location of lighter atoms of biological relevance such as Cl, K and Ca and assistance with low-resolution model building by locating P or S atom positions.
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