A regional difference in the time of initial synthesis of ribosomal RNA in frog embryos.
D000818:Animals; D001001:Anura / Q000196:embryology*; D002247:Carbon Isotopes; D002454:Cell Differentiation; D002499:Centrifugation, Density Gradient; D004475:Ectoderm / Q000378:metabolism*; D004707:Endoderm / Q000378:metabolism*; D008648:Mesoderm / Q000378:metabolism*; D012313:RNA / Q000096:biosynthesis*; D013395:Sucrose; D013997:Time Factors; D014316:Tritium; D014529:Uridine / Q000378:metabolism
D002247:Carbon Isotopes; D014316:Tritium; D013395:Sucrose; D012313:RNA; D014529:Uridine