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The crystal structure of quinolinic acid phosphoribosyltransferase from Helicobacter pylori (PDB ID: 2B7N) used in the study was obtained from the protein data bank (http://www.rcsb.org.pdb) [19]. The 2B7N was obtained by X-ray diffraction method. Discovery Studio 4.0 [20] visualizer was used to remove all solvent molecules and bounded substances (ligands and cofactors) with the receptor and then it was saved in PDB format.

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