The research suggests the two species diverged from one another approximately 22 million years ago.
The team of scientists sequenced 14 genomes from several species: both living and extinct species from Asia and Africa, two American mastodons, a 120,000-year-old straight-tusked elephant, and a Columbian mammoth.
One of the best ways to understand a virus is to understand how it has evolved, says evolutionary geneticist Hendrik Poinar.
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