title: Ribosomal ribonucleic acid of the sea urchin egg and its fate during embryogenesis.
mesh_terms: D000818:Animals; D002499:Centrifugation, Density Gradient; D004447:Echinodermata; D004625:Embryo, Nonmammalian / Q000378:metabolism*; D005260:Female; D006358:Hot Temperature; D066298:In Vitro Techniques; D010063:Ovum / Q000166:cytology*; D012313:RNA / Q000032:analysis / Q000378:metabolism*; D012270:Ribosomes / Q000378:metabolism*; D013936:Thymidine / Q000378:metabolism; D014316:Tritium; D014529:Uridine / Q000378:metabolism
chemical_list: D014316:Tritium; D012313:RNA; D013936:Thymidine; D014529:Uridine