title: Replicative heterogeneity of mammalian DNA.
mesh_terms: D000225:Adenine / Q000378:metabolism; D000818:Animals; D001345:Autoradiography; D002247:Carbon Isotopes; D002452:Cell Count; D002460:Cell Line; D002499:Centrifugation, Density Gradient; D006224:Cricetinae; D003596:Cytosine / Q000378:metabolism; D004247:DNA / Q000032:analysis / Q000302:isolation & purification; D004261:DNA Replication; D006147:Guanine / Q000378:metabolism; D006570:Heterochromatin / Q000096:biosynthesis; D008168:Lung; D008722:Methods; D008938:Mitosis; D013936:Thymidine / Q000378:metabolism; D013941:Thymine / Q000378:metabolism; D013997:Time Factors; D014316:Tritium
chemical_list: D002247:Carbon Isotopes; D006570:Heterochromatin; D014316:Tritium; D006147:Guanine; D003596:Cytosine; D004247:DNA; D000225:Adenine; D013941:Thymine; D013936:Thymidine