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Apo TbtB superimposed on NisB-Val169Cys. β–strands are shown in brown for TbtB and in khaki for NisB-Val169Cys. One NisB-Val169Cys monomer is made 80% transparent for clarity. Helices of the glutamylation and elimination domains of NisB-Val169Cys are shown in purple and green, respectively. Two NisA-Ser3DapGlu molecules bound to the NisB-Val169Cys homodimer are not shown.
