Opening the Pandoravirus Box: what do very large viruses tell us about viral origins?

Just what is a virus, and where did they come from? Considering that the field of virology dates back to the mid 1800s, it may come as a surprise that these questions are still controversial, and yet, they are. Recently, a team of French scientists discovered viruses of a size and complexity never seen before, and this discovery has been highly disruptive to the controversy.

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