Unusual ligand structure in Ni–Fe active center and an additional Mg site in hydrogenase revealed by high resolution X-ray structure analysis

PROCHECK: a program to check the stereochemical quality of protein structures

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MOLSCRIPT: a program to produce both detailed and schematic plots of protein structures

P. Kraulis · Journal of Applied Crystallography · 1991 · 14.1K citations · Full text

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Improved methods for building protein models in electron density maps and the location of errors in these models

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Comprehensive Coordination Chemistry

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Free R value: a novel statistical quantity for assessing the accuracy of crystal structures

Axel T. Brünger · Nature · 1992 · 3.9K citations

Natural Sciences, Chemistry, Physics +16