BILATERAL GENE TRANSFER between viruses and phytoplankton. “The first case of horizontal gene transfer of multiple functionally linked enzymes in a eukaryotic phytoplankton-virus system. The virus-to-host direction suggests the existence of ancient viruses that controlled the complex metabolic pathway… the host-to-virus direction suggests that the serial acquisition of genes involved in the same metabolic pathway… a strategy for the ancestor of EhVs to stay ahead of their closest relatives in the great evolutionary race for survival.””
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http://www.ncbi.nlm.nih.gov/m/pubmed/19451591/