title: Transcription of 4S RNA in Limnaea (mollusc) embryos.
mesh_terms: D000818:Animals; D004625:Embryo, Nonmammalian; D005815:Genetic Code; D008974:Mollusca / Q000196:embryology; D010759:Phosphorus Isotopes; D012313:RNA / Q000096:biosynthesis*
chemical_list: D010759:Phosphorus Isotopes; D012313:RNA