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Proposed models for AT secretion. The folded N-terminal passenger domains are depicted as triangles and the C-terminal domains as cylinders anchored in the OM. The folding initiator domain at the C terminus of the passenger is indicated with a darker triangle. Omp85 represents an OM hetero-oligomeric protein complex composed of at least four currently identified components in E. coli: Omp85/YaeT, YfgL, YfiO, and NlpB. S, cell surface; P periplasm.
