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Legend: Process 1a: A vesicular mechanism is proposed for trafficking of membrane proteins and certain lipids between cellular organelles in the secretory pathways. Process 1b: The vesicular transfer of lipids from the inner chloroplast envelope to the thylakoids. Process 2: Polar lipid flipping across the ER, outer and inner chloroplast envelope membranes. Process 3: Lipid transfer through membrane contact sites between ER and plastids, mitochondria, plasma membrane or vacuoles. Abbreviations: ALA1, Aminophospholipid ATPase ; VIPP1, Vesicle-inducing protein in plastids, TGD1, Permease-like protein of inner chloroplast envelope, TGD2, Phosphatidic acid-binding protein, TGD3, ATPase, TGD4, Protein involved in lipid transport.