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Analysis of native and amplified CP81 DNA. (A) Loss of native CP81 DNA after extraction with phenol. Native DNA of group II phage NCTC12684 and the amplified DNAs of both phages were not lost after phenol extraction. (B) Susceptibility of native and amplified CP81 DNA to cleavage by restriction endonucleases whose recognition sites are composed of A/T and G/C sequences.
