STRuster is a method for clustering alternative structural models corresponding to different structure determination experiments. Alternative structural models, determined by X-ray crystallography or NMR spectroscopy, are frequently available for a given protein. These models can present significant structural dissimilarity. The structures are classified according to backbone structure similarity.
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Domingues, F. S.; Rahnenfuhrer, J.; Lengauer, T.,
Conformational analysis of alternative protein structures.
Bioinformatics 2007, 23 (23), 3131-8.