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Gain of ORPV genes at different stages of evolution of chordopoxviruses. Each circle associated with a tree branch shows the node number from which the branch emits (see Table S5A) and the number of genes inferred to have been gained at the branch. The callouts (blue boxes) indicate the inferred points of entry of the ancestors of the major families of paralogous accessory genes into the evolving poxvirus genomes. The chordopoxvirus genera are indicated to the right of the tree.
