title: Gene amplification in mammary gland at differentiation.
mesh_terms: D000818:Animals; D002499:Centrifugation, Density Gradient; D004247:DNA / Q000096:biosynthesis*; D005260:Female; D005796:Genes; D007774:Lactation; D008321:Mammary Glands, Animal / Q000254:growth & development / Q000378:metabolism*; D051379:Mice; D011247:Pregnancy; D013936:Thymidine / Q000378:metabolism; D014316:Tritium
chemical_list: D014316:Tritium; D004247:DNA; D013936:Thymidine