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Figure 2.
Fig. 2. Two monomers stabilized by tungsten clusters; the
ligand-binding domains have been labeled R2 to R7 and R2* to
R7*, respectively. The linkers between R4 and R5 and R4* and R5*
meet at a crystallographic twofold axis. At a distance below, a
cluster (center) sits on the twofold as well.
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