title: Messenger ribonucleoprotein particles in unfertilized sea urchin eggs.
mesh_terms: D000818:Animals; D002499:Centrifugation, Density Gradient; D005260:Female; D008274:Magnesium / Q000494:pharmacology; D008970:Molecular Weight; D009698:Nucleoproteins / Q000032:analysis*; D010063:Ovum / Q000032:analysis*; D011061:Poly A; D011188:Potassium / Q000494:pharmacology; D012333:RNA, Messenger / Q000032:analysis*; D012261:Ribonucleoproteins / Q000032:analysis*; D012617:Sea Urchins; D012964:Sodium / Q000494:pharmacology
chemical_list: D009698:Nucleoproteins; D012333:RNA, Messenger; D012261:Ribonucleoproteins; D011061:Poly A; D012964:Sodium; D008274:Magnesium; D011188:Potassium