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Structural details of Amt-1. (A) Structural comparison of Amt-1 (red) with E. coli AmtB (black). (B) Xenon binding to internal cavities in Amt-1. The surface representation shows the substrate channel and several internal cavities as well as the positions of 9 of a total of 15 Xe atoms located in the structure. The residues depicted as sticks are the same as in Fig. 4.
