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A six-way Venn diagram showing the distribution in percentages of the 7,715 of the total 8,178 human ohnolog pairs that are identified by at least one outgroup and predicted from the relaxed criteria. Only 3.8% of human ohnolog pairs are identified by all outgroup. Each of the shaded sectors in green contributes to more than 2% of all ohnolog pairs (numbers of ohnolog pairs are given in S8 Fig).
