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  • Study adds to evidence that viruses are alive

    Their diversity makes viruses difficult to classify. A new study uses protein folds as evidence that viruses are living entities that belong on their own branch of the tree of life.

    Graphic by Julie McMahon


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  • Editor’s notes:

    To reach Gustavo Caetano-Anollés, call 217-333-8172; email

    To reach Arshan Nasir, email

    The paper “A phylogenomic data-driven exploration of viral origins and evolution” is available online