The Ancient Weapons Active in Your Immune System Today

Evolutionary arms races — where one species is pitted against another, driving the evolution of new or more sophisticated weapons as each tries to gain the upper hand — are ubiquitous in nature. One of the oldest and fiercest battles has been waged for billions of years between bacteria and the viruses that infect them. This escalating warfare has selected for bacteriophage viruses (or “phages”)…
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