2F2F:
reference: Variation of loop sequence alters stability of cytolethal distending toxin (CDT): crystal structure of CDT from Actinobacillus actinomycetemcomitans., Yamada T, Komoto J, Saiki K, Konishi K, Takusagawa F, Protein Sci. 2006 Feb;15(2):362-72. PMID: 16434747

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