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Restriction Endonucleases Restriction Endonucleases Introduction A bacteriophage is a virus that infects bacteria. A type of bacteriophage is bacteriophage lambda. This specific bacteriophage infects E. Coli. It is composed of protein and double stranded DNA ЎVdsDNA). The DNA of the phage contains around 50,000 base pairs and codes for 50 proteins. At both ends of.