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Figure 7.
FIG. 7. The C-terminal histidine of the chains in the deoxy
form. The position of this residue is almost identical in the
structures at pH 5 and 7.5. Ser-93 hydrogen bonds to Asp-94
through its side chain
hydroxyl group (shown as a red dotted line), but the imidazole
group of His-146 is too far (>3.5
Å) from the Asp for a strong bonding interaction.
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