title: Poly(A)-containing RNA in early embryogenesis of sea urchins.
abstract: The content, biosynthesis and template activity of poly(A)+ RNA in the early stages of sea urchin development have been studied. The amount of poly(A)+ RNA reaches a maximum at the middle blastula stage in polyribosomes and at the 8-blastomere stage in the cytoplasm. Poly(A)+ RNA synthesis becomes noticeable at the 64-blastomere stage and the spectrum of newly synthesized molecules is different from that at the middle blastula stage. The products of translation in vitro of poly(A)+ RNA at all the stages studied show insignificant differences and contain a major group of polypeptides of molecular mass 10-20 kDa.
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000502:physiology; D004625:Embryo, Nonmammalian / Q000502:physiology*; D005260:Female; D005775:Gastrula / Q000502:physiology; D010063:Ovum / Q000502:physiology; D010944:Plants / Q000378:metabolism; D011061:Poly A / Q000235:genetics* / Q000302:isolation & purification; D011132:Polyribosomes / Q000378:metabolism; D014176:Protein Biosynthesis; D012313:RNA / Q000235:genetics* / Q000302:isolation & purification; D012333:RNA, Messenger; D012617:Sea Urchins; D013698:Templates, Genetic; D014908:Triticum / Q000378:metabolism
chemical_list: D012333:RNA, Messenger; D011061:Poly A; D012313:RNA