Fine structure of the nucleolus in normal and mutant Xenopus embryos.

Animals Anura/embryology Cell Division Cell Nucleolus Chromosomes/analysis Embryo, Nonmammalian/cytology Embryonic and Fetal Development Germ Layers Histocytochemistry Histological Techniques Microscopy, Electron Mutation Nucleic Acids/analysis RNA/analysis RNA, Ribosomal/biosynthesis Ribonucleases Ribosomes/metabolism Staining and Labeling

Nucleic Acids RNA, Ribosomal RNA Ribonucleases