CRISPR had a life before it became a gene-editing tool

Natural CRISPR systems immunize bacteria from invading viruses, and more

phages

WEAPONS OF MASS EVOLUTION  Bacteria and archaea armed with CRISPR systems have been at war with viruses for eons. Here, hordes of viruses known as phages assault a bacterium to turn it into a virus-making factory.

AMI IMAGES/SCIENCE SOURCE

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