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. 2003 Sep 17;100(20):11382–11387. doi: 10.1073/pnas.1932486100

Fig. 1.

Fig. 1.

Ribbon diagram depicting the crystal structure of the substrate-free form of BtuB (1). (A) Residues 6–17 are highlighted and include the energy-coupling segment or Ton box (residues 6–12). (B) An enlargement with residues 6–17 shown in stick form with several side chains labeled.