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MolProbity is a structure validation web service for diagnosing problems in 3D models of proteins, nucleic acids or complexes. It adds and optimizes H atoms (correcting 180° flipped Asn/Gln/His sidechains), and then calculates global and local validation for all-atom contacts (steric clashes, H-bonds & vdW), covalent geometry, and conformation (Ramachandran & rotamers for protein, ribose puckers & suite conformers for RNA). Results are displayed online as 3D graphics and sortable charts.
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