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E.coli JM 109 is the most preferred strain in carrying out recombinant DNA techniques as it known to possess a stable genotype. This Strain also contains a F`episome which helps in blue/white screening and ss DNA rescue . It is used for the preparation of ssDNA , gene library construction and also cloning.

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Q: Why do you often use JM109 strain of E. coli as lab strain?
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