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A fragment containing the SfeI restriction–modification system (RMS) operon was cloned from a Streptococcus faecalis SE72 plasmid. Nucleotide sequence analysis revealed its high (99.2%) homology to the operon for Lactococcus lactis subsp. cremoris W56 LlaBI RMS recognizing the same site, 5"-CTRYAG-3". A substantial difference was that SfeI RMS operon had an additional 198-bp segment in the...
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