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Figure 3.
FIGURE 3. The conserved disulfide bond and Ca^2+-binding
region in the P domain. A, the Ca^2+-binding loop is stabilized
by the conserved disulfide bond between Cys-270 and Cys-283. B,
the 2F^o - F^c electron density is contoured at 1 at the
region between Asp-282 and His-284. The Asp-282–Cys-283
peptide bond is in the normal trans configuration (arrow). C,
the 2F^o - F^c electron density is contoured at 1.7 at the
calcium-binding site. The Ca^2+ is shown as a yellow sphere.
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