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Reconstruction of the evolution of the gene repertoire of the NCLDVs. The numbers at internal branches (shown only for the ASFV-Poxviridae branch and for the root) indicate the maximum likelihood estimates of the number of genes mapped to the respective ancestral form. The numbers after the virus names indicate the number of annotated genes. The NCLDV families used as outgroups are shown by triangles. The NCLDV tree topology is from reference 25.
