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Figure 3.
FIG. 3. a, schematic showing the distances among waters in
the main channel of the D181E variant. The potential hydrogen
bonds are shown as dashed lines, and the distances are expressed
in Å. The water numbering is as in Fig. 2 and Table IV. b,
stereo view oriented down the main channel toward the heme from
Asp181. The slightly shifted location of the Glu side chain in
the D181E variant is indicated in green. The water numbering is
as in a.
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