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. 2008 Aug 20;105(34):12194–12199. doi: 10.1073/pnas.0803154105

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© 2008 by The National Academy of Sciences of the USA

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Fig. 6. — Variation of Doc orientations in clostridial complexes. Ribbon representations of (A) C. perfringens μ-toxin Doc (light blue) on CpGH84CX82 (light green); (B) native C. thermocellum type-I Doc (red) on type-I cohesin (yellow) (16); (C) C. thermocellum Ser45Ala/Thr46Ala type-I Doc mutant (red) on type-I cohesin (yellow) (36); (D) C. thermocellum type-II Doc (emerald green) on type-II cohesin (slate blue) (13). The helices within the two F-hand motifs of the Doc modules are identified as α1 and α2, respectively.