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Credit: FRANCIS LEROY, BIOCOSMOS/SCIENCE PHOTO LIBRARY
Caption: Lysogenic viral cycle. Diagram showing the lysogenic cycle for viral reproduction. The example given here is for bacteriophages, viruses that infect bacteria. At upper left, the bacteriophage (yellow) attaches to the bacteria (blue oval) and injects its viral DNA (red, deoxyribonucleic acid). This viral DNA fragment is referred to as a prophage (red loop). At upper right, it has been incorporated with the bacterial DNA (blue loop). At lower right, the bacterial cells divide normally, producing copies of the prophage which may at some future point reactivate to form new bacteriophages. Unlike the lytic cycle, the host cells are not destroyed.
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