Double isotope autoradiography.
D000818:Animals; D001345:Autoradiography; D002247:Carbon Isotopes; D002642:Chick Embryo; D004247:DNA / Q000096:biosynthesis; D066298:In Vitro Techniques; D012313:RNA / Q000096:biosynthesis; D013936:Thymidine / Q000378:metabolism; D014316:Tritium; D014529:Uridine / Q000378:metabolism
D002247:Carbon Isotopes; D014316:Tritium; D012313:RNA; D004247:DNA; D013936:Thymidine; D014529:Uridine