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(A) The continuous chain of water molecules from D132 to D286 in the D-channel of the aa3-type oxidase from R. sphaeroides (2). The water hydrogens and orientations were estimated using the software Whatif (24). (B) Structural detail of the region around N139 showing water molecules (red spheres) and other residues discussed in the text. From (PDB code :2GSM).
