Synthesis of ribosomal RNA during sea urchin development. 3. Evidence for an activation of transcription.
D000818:Animals; D002499:Centrifugation, Density Gradient; D004247:DNA / Q000378:metabolism; D004447:Echinodermata / Q000196:embryology / Q000378:metabolism; D010759:Phosphorus Isotopes; D012313:RNA / Q000096:biosynthesis*; D012270:Ribosomes / Q000378:metabolism*
D010759:Phosphorus Isotopes; D012313:RNA; D004247:DNA