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Figure 2.
Fig. 2. Interactions between the P[1] lysine residue and
the S[1]-binding pocket. The S[1] residues P275, D277, and D325
and the P[1] lysine are displayed as green ball-and-stick
models. The S[1] calcium ion and the coordinating water molecule
are rendered as gray and red spheres, respectively. The
distances between the S[1] residues and the P[1] lysine side
chain are indicated with dashed lines. The distances among the
atoms are a = 2.75, b = 2.81, c = 3.73, d = 2.82, and e = 2.72
Å. 2F[o] – F[c] density rendered at 2.0  for the
P[1] lysine, H213, and S385 is shown as a blue mesh.
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