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Phylogenetic trees of select virologs mentioned in the text. Some virologs have deep placement indicative of ancient gene exchange (DNA primase and mRNA capping enzyme), while others have been acquired more recently (K+ transporter and myosin). Moreover, some virologs appear to have been acquired by viruses multiple times independently (rhodopsin, synaptobrevin, Bax1 apoptosis inhibitor and K+ transporter).
