Scouring genomes from 46 kinds of mammals, researchers have plucked out a startling insight about the origin of lentiviruses, a clan that includes HIV, equine anemia, and other devastating diseases. Lentiviruses have been infecting vertebrate genomes for far longer than anyone had previously shown, and the "genomic fossil" that led to this new discovery comes from the European rabbit (Oryctolagus cuniculus), a species that until now no one had connected to these pathogens.
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