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Figure 1.
Fig. 1. Details of the interactions that stabilize the loop
at the C terminus of the duplicated helix. (a) L20 (the design
template). (b) L20/R63A in the presence of guanidinium.
Distances (black) are shown in Å; in green are the
corresponding distances in the WT structure. The superimposed
F[o] - F[c] difference map contoured at 3.3  (red) defines the
position of the ligand.
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