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On the left is the gene tree for paaC, in the middle are the clusters of genes in which the respective paaC genes are found, with the paaC genes aligned to one another and facing away from the tree. On the right are the organism abbreviations (see supplementary information for list of organisms and abbreviations) and the gene number for the paaC gene, which indicates how many genes between it and the origin of replication for the genome in which it is found.
