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Possible relationship between tandem duplications and circular permutations among the shell proteins. Helices are shown as cylinders and β-strands are shown as arrows. The structure of EutL is composed of 2 very similar domains that are likely to have been the result of a direct duplication event of a gene like EutS. With the introduction of a new start codon and a stop codon, a permutated domain structure can be generated.
