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Figure 2.
Fig. 2. (A) A view perpendicular to the  , barrel, showing
the disposition of the zinc ion and the extended domain. (B)
View down the spindle axis of the toroid showing the relative
positions of seven sets of helices. The
catalytic zinc ion is located near the center of the toroid
adjacent to the extended domain. The figures were created with
Ribbons software (33).
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