title: Nuclear RNA synthesis in sea urchin embryos.
mesh_terms: D000818:Animals; D001345:Autoradiography; D002247:Carbon Isotopes; D002458:Cell Fractionation; D002467:Cell Nucleus / Q000032:analysis / Q000378:metabolism*; D002499:Centrifugation, Density Gradient; D003593:Cytoplasm / Q000032:analysis; D004589:Electrophoresis, Disc; D004625:Embryo, Nonmammalian / Q000032:analysis / Q000378:metabolism*; D008715:Methionine / Q000378:metabolism; D008722:Methods; D008854:Microscopy, Electron; D008858:Microscopy, Phase-Contrast; D008970:Molecular Weight; D012313:RNA / Q000096:biosynthesis* / Q000302:isolation & purification; D012335:RNA, Ribosomal / Q000096:biosynthesis / Q000302:isolation & purification; D012617:Sea Urchins / Q000196:embryology*; D013501:Surface-Active Agents; D014316:Tritium; D014529:Uridine / Q000378:metabolism
chemical_list: D002247:Carbon Isotopes; D012335:RNA, Ribosomal; D013501:Surface-Active Agents; D014316:Tritium; D012313:RNA; D008715:Methionine; D014529:Uridine