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P22 Bacteriophage are ds DNA viruses (family Podoviridae) that attack salmonella bacteria. They are encased in an icosahedral protein capsid which contains the coiled double stranded DNA genome (shown here as concentric reddish shells just visible through the translucent sepia capsid). From one vertex sprouts a hypodermic like assembly that can penetrate bacteria and inject the viral genome. This tail also acts as a plug to keep the genome inside. With thanks to Ed Rybicki. Useful links: |