Come i virus modellano il nostro mondo.

COVID-19 is a reminder of their destructive power, but they’re crucial to humans’ development and survival.

Although feared as agents of disease, viruses also work wonders, shaping evolution from the very beginning. About 8 percent of our DNA comes from viruses that infected our long-ago ancestors and patched viral genes into their genomes. Some of these genes now play crucial roles in the early stages of the developing embryo and the placenta that surrounds this 13-week-old fetus.

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