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A Phage or Bacteriophage (from the Greek word phagein meaning "to eat") is a class of virus that will infect bacterial hosts, they are also used as model organisms for the study of the molecular biology and replication of viruses. A key example is the T4 phage that will infect an E. coli host cell. T4 phages are made up a a protein head that contains the genetic information of the virus, along with a tail and tail fibres that permit the injection of genetic material into the host cell, these structures are made of protein  [1].


  1. Michael Madigan, John Martinko, David Stahl, David Clark. (2012) Brock Biology of Microorganisms, Thirteenth Edition, San Francisco: Pearson. 267-268
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