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Bacteriophage P22. Computer artwork of an enterobacteria phage P22 particle. A bacteriophage, or phage, is a virus that infects bacteria. Enterobacteria P22 infects Salmonella typhimurium bacteria. The phage consists of an icosahedral (20-sided) head (upper centre), which contains the genetic material, DNA (deoxyribonucleic acid, red), a short tail and tail fibres (leg-like), which fix it to a specific receptor site.
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