title: Ribosomal RNA synthesis in pre- and postgastrula embryos of Xenopus laevis.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002465:Cell Movement; D002501:Centrifugation, Zonal; D008715:Methionine / Q000378:metabolism; D012335:RNA, Ribosomal / Q000032:analysis / Q000096:biosynthesis*; D014316:Tritium; D014981:Xenopus / Q000196:embryology*
chemical_list: D012335:RNA, Ribosomal; D014316:Tritium; D008715:Methionine