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Structure of the FliHC2–FliI heterotrimeric complex in the crystal. (A) The dimeric unit of the FliHC2–FliI complex. (B) Two dimeric units (trimer-1 and -2, and trimer-3 and -4) in the crystal asymmetric unit. Trimer-1 and -2 are related to trimer-3 and -4, respectively, by a pseudotwofold axis perpendicular to the sheet. (C) Two dimeric units viewed from the bottom of B.
