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Figure 4.
Figure 4. Structure of the PurM dimer. Ribbon diagram
viewed down the twofold axis. Major structural features and the
strands of the central b barrel, which form most of the dimer
interface, are labeled. For subunit 1, the domain-A ribbon is
highlighted in gold, the domain-B ribbon is highlighted in
silver and the linker is shown in red. For subunit 2, the ribbon
is highlighted in light blue.
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