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Ball, S.; Colleoni, C.; Cenci, U.; Raj, J. N.; Tirtiaux, C. The evolution of glycogen and starch metabolism in eukaryotes gives molecular clues to understand the establishment of plastid endosymbiosis. Journal of Experimental Botany. 10 January 2011, 62 (6): 1775–1801. PMID 21220783. doi:10.1093/jxb/erq411.