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Figure 6.
Fig. 6. The crystal structure of LoopA at low pH. (A) The
repeating unit contains a domain-swapped dimer (cyan, chain 1;
green, chain 2) and a monomer (purple). Electron density is not
present for the redesigned loop in the monomer. In the dimer,
the loop opens up, and strands 1 and 2 insert into the partner
molecule. (B) The designed loop appears to be stabilized by
protonated glutamic acid residues.
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