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Figure 4.
Periplasmic pore constriction of AmtB wild type and variants.
The solvent-accessible space shown as a light blue surface was
calculated by using the program CAVER, with a water-omitted
structure. (A) F107A. (B) F215A. (C) F107A/F215A. Selected,
highly conserved residues are shown in ball-and-stick
representation for the ammonium binding site, phenylalanine
gate, and central pore. The substitutions are labeled in red.
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