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Figure 3.
FIGURE 3. Ca^2+ binding sites. The structures of the Ca-1
(A), Ca-2 to Ca-5 (B), and Ca-6 (D) sites are shown. The Ca^2+
ions and water molecules are represented by spheres. The
residues that bind to the Ca^2+ ions are labeled. In C, a stereo
view of the central   substructure consisting
of the 6m-helix, 5m-strand, and 7m-helix
and the 1m-strand are shown in a
ribbon drawing. One of the active site residues, Asp^115, is
indicated by a stick model.
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