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We study gene family coevolution on a tree of life based on a large-scale ancestral gene content reconstruction, which includes gene duplication and deletion events. The insights obtained from this study are threefold: (1) Global properties, such as the distribution of coevolution partners and the formation of disconnected clusters of coevolving families, can be an inevitable consequence of evolution along a tree. (2) Concerted family expansion (gene duplication) and contraction (gene deletion)doi:10.1101/gr.6815508 pmid:18230804 pmcid:PMC2259110 fatcat:lvf3x2lklrghnowctilrcpukuu