DNA modification and restriction.
D001483:Base Sequence; D002874:Chromosome Mapping; D002876:Chromosomes, Bacterial / Q000378:metabolism; D003090:Coliphages / Q000378:metabolism; D004247:DNA / Q000096:biosynthesis / Q000378:metabolism*; D004279:DNA, Viral / Q000378:metabolism; D004720:Endonucleases / Q000302:isolation & purification / Q000378:metabolism; D004926:Escherichia coli / Q000166:cytology / Q000378:metabolism; D005799:Genes, Dominant; D005827:Genetics, Microbial; D006193:Haemophilus influenzae / Q000166:cytology / Q000378:metabolism; D006238:Haploidy; D009154:Mutation
D004279:DNA, Viral; D004247:DNA; D004720:Endonucleases