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Mechanisms of the ER-to-IM phospholipid transfer (left) and LPS transport (right). Regions responsible for similar functions are displayed in the same colors. Arrows indicate the lipid flow. For clarity, peptidoglycan layers are not shown in LPS transport. (G3P) Glycerol 3-phosphate, (FFA) free fatty acid, (Pi) inorganic phosphate, (PPi) inorganic pyrophosphate.
