title: Isolation and in vitro restriction of unmethylated DNA from Escherichia coli K.
mesh_terms: D002250:Carbon Radioisotopes; D002499:Centrifugation, Density Gradient; D002850:Chromatography, Gel; D004261:DNA Replication; D004269:DNA, Bacterial / Q000096:biosynthesis / Q000302:isolation & purification / Q000378:metabolism*; D004720:Endonucleases; D004926:Escherichia coli / Q000201:enzymology / Q000378:metabolism*; D007553:Isotope Labeling; D008433:Mathematics; D008715:Methionine / Q000378:metabolism; D008745:Methylation; D008780:Methyltransferases / Q000378:metabolism; D008970:Molecular Weight; D009154:Mutation; D009587:Nitrogen Isotopes; D012436:S-Adenosylmethionine; D013696:Temperature; D013941:Thymine; D014316:Tritium
chemical_list: D002250:Carbon Radioisotopes; D004269:DNA, Bacterial; D009587:Nitrogen Isotopes; D014316:Tritium; D012436:S-Adenosylmethionine; D008715:Methionine; D008780:Methyltransferases; D004720:Endonucleases; D013941:Thymine