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DNA isolated from streptococcal bacteriophage c6A was cut only infrequently by many restriction endonucleases. Fragments of c6A DNA cloned in Escherichia coli plasmids were similarly resistant to cleavage. We conclude that the low frequency of cleavage is due to an unusually low number of restriction enzyme recognition sequences in c6A DNA.
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Powell et al. (1986) studied this question.
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