Discovery of PARIS antiviral immunity system mechanism reveals new function for viral tRNA

Bacteriophages, viruses that infect bacterial cells, are natural predators and enemies of bacteria. When a phage infects a cell, it lyses, and dozens or even hundreds of new viral particles—phage progeny—are released. The ongoing arms race between bacteria and phages has resulted in the development of a variety of bacterial innate and adaptive immune systems and anti-immune systems in phages.