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Structures of free CsdA and CsdA-CsdE. A, dimeric CsdA is shown with designation of CsdE interaction-mediating structural elements. B, dimeric CsdA-CsdE is shown with active cysteines, indication of the missing loop in CsdA(a), and the designation of structural elements on CsdE. Regions of CsdE(a′) with higher B-factors than the average (55.9 Å2) are not included in the ribbon diagram. C, boxed region in B is magnified for clarity.
