Ribonucleic acids from animal cells.

INTRODUCTION ................................................................ 262 TECHNICAL ASPECTS OF RNA BIOCHEMISTRYC. .. 263 Size ...263 Compositio.... . 263 Methylation . .263 RNA-DNA Hybridization ...264 Cell Fractionation ......................................................... 264 PATTERNS OF SYNTHESIS OF ANIMAL CELL R.. ........ .. 264 "Rapidly Labeled RNA" and Kinetic Analysis Experimes .... 264 BIOSYNTHESIS OF RlBOSOMES IN ANIMAL CELLS . .. 267 Ribosomal PrecursorRNA..... 267 Formation and Distribution of Ribosomal Particles .. 272 Ribosomal Proteins and Nucleolar Ribosomal Precursors 274 Association of Ribosomal Protein withrRNA.. 276 Place of Small RNA Molecules in RibosomalMaturatiot.. 276 Control of Ribosome Formation.277 PRECURSORS TO TRNA MOLECULES ...279 DNA-LIKE RNA SPECIES...................................................... 280 Definition and Distribution of DNA-like RNA 280 HnRNA: Properties and Problems.283 Use ofRNA-DNA Hybridizationz in the Study ofDNA-like RNA Species.284 CONCLUSIONS ............................................. 286 LITERATURE CITED ........................................................... 287