Summary
All known determinants of the restriction, modification specificity hsp II are plasmids of the compatibility class N. Two I-like R factors, R56 and R64 are able to interfere with the lytic cycle of phage λ (in liberation of phage by lysogens or newly infected cells) by a different mechanism.
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Hedges, R.W. Phenotypic characterization of fi − R factors determining the restriction and modification hsp II specificity. Molec. Gen. Genet. 115, 225–233 (1972). https://doi.org/10.1007/BF00268886
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DOI: https://doi.org/10.1007/BF00268886