Visualisation in the electron microscope and size of RNA from animal cells.

Animals Avian Leukosis Virus Bombyx Carbon Isotopes Centrifugation, Density Gradient Ducks Encephalomyocarditis virus Erythrocytes Escherichia coli HeLa Cells Methods Microscopy, Electron Molecular Weight Poliovirus RNA/biosynthesis RNA, Bacterial RNA, Messenger RNA, Viral Reoviridae Ribosomes Thymidine/metabolism Tritium Uridine/metabolism

Carbon Isotopes RNA, Bacterial RNA, Messenger RNA, Viral Tritium RNA Thymidine Uridine