GUNILLA ELAM / SCIENCE PHOTO LIBRARY GUNILLA ELAM / SCIENCE PHOTO LIBRARY
Bacterial defence against bacteriophage. Computer illustration showing a bacteriophage virus particle (virion, orange) attacking a bacterial cell. Bacteriophages are viruses that infect bacteria. They attach to specific receptor sites on the bacterium. They then inject their genetic material (red strands) into the host in order to make the bacterium manufacture more copies of the virus. The bacterium defends itself by releasing enzymes called restriction endonucleases (yellow) which cut up the phage's genetic material into harmless fragments.
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