By nature of its infectivity,M13 phage can be used in the laboratory to continually propagate a particular DNA sequence inside of Escherichia coli by simply culturing infected E.coli in LB.

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M13 phage is a bacteriophage that infects E. coli and can be used to propagate a particular DNA sequence inside of E. coli by culturing infected E. coli in LB. This is because the M13 phage is able to incorporate its DNA into the host E. coli's genome, enabling the continuous propagation of the desired DNA sequence.

By Nature of Its Infectivity,M13 Phage Can Be Used in the Laboratory