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CrystalMaker drawing of the crystallograhic structural model for the active site obtained for B. pasteurii urease complexed with citrate (PDB code 4AC7). The nickel ions are represented in gray, while CPK coloring is used for all other atoms. The BPU residue-numbering scheme (all residues belonging to the alpha subunit) is used. The residue indicated with the letter âKâ is the carbamylated lysine.
