Primate phylogeny with the appearance of new endogenous retroviral families and new tandem ZF genes. Data were derived by tracking the first appearance of human ERV families and tandem ZF genes (Supplemental Methods). On each branch leading to the human, the top number indicates the number of tandem ZF gene duplicates (with additional duplicates that diverged by <5% in amino acid sequence in parentheses) and the bottom number indicates the number of new ERV families. Four families of ERVs could not be confidently assigned to a specific branch and are shown straddling the Simian/Catarrhine branch point. The R2 and ANOVA P-value shown are for the peak correlation based on various criteria for partitioning the data (see Supplemental Table S7); all other partitions were also significant. The gorilla genome is low coverage and was not systematically analyzed, but the single ERV (HERV-Fc1) that appears on the branch leading to human and chimpanzee is clearly present in gorilla (data not shown). The Hominoid and Hominid branches are split by the gibbons, for which there are currently no genome assemblies.
