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Schematic view of dynamic changes of operons.
Notes: Illustration of three possible types when comparing operon A and operon B. (i) Deletion: gene-3 was deleted in operon B. (ii) Unchanged: operon A and operon B had similar genes. (iii) Elongation: operon A was elongated to operon B where gene-4′ denotes the newly added gene in operon B.
