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Phylogenetic tree inferred by using host- and virus-encoded IL-10 proteins. Numbers on the branches are bootstrap values for 1,000 replicates expressed as percentage. Virus-encoded IL-10s are shown in bold. Clusters of host (piscine, amphibian, avian, and mammalian) IL-10 genes and eight (A to H) putatively independent host gene capture events are indicated. The systematic assignment of fish species at the level of taxonomic order is also indicated.
