Highlights • Retroviruses are a virus family of considerable medical and veterinary importance.• Until recently, very little was known about deep retroviral origins.• New research supports a marine origin of… Click to show full abstract
Highlights • Retroviruses are a virus family of considerable medical and veterinary importance.• Until recently, very little was known about deep retroviral origins.• New research supports a marine origin of retroviruses, ∼460–550 million years ago.• The evolutionary events leading to the origin of retroviruses remain obscure.• Improved understanding of Metaviridae diversity and evolution are required for this.
               
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