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Schematic representation of plastid evolution. Schematic representation of primary and secondary endosymbiosis, and organelle architecture. EpM, epiplastidial membrane; PPM, periplastidial membrane; P-oEM and P-iEM, plastid outer and inner envelope membranes respectively; Thyl, thylakoids; N-oEM and P-iEM, nucleus outer and inner envelope membranes respectively.
