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Neighbor-joining trees for homologous protein present in conserved gene clusters: NdmC (A), NdmD (B), and NdmE (C). Full strain names are listed in Table S2 in the supplemental material. Operons containing two NdmC proteins are colored: the first NdmC homolog is red, and the second is blue. NdmD and NdmE proteins in those strains are in purple.
