Two proteins are bound to most species of polysomal mRNA.

Adenosine/metabolism Animals Brain/cytology,metabolism Carbon Isotopes Centrifugation, Density Gradient Chick Embryo Cytidine/metabolism Electrophoresis, Polyacrylamide Gel In Vitro Techniques Molecular Weight Nucleoproteins/metabolism Polyribosomes/analysis,metabolism Protein Binding/drug effects Puromycin/pharmacology RNA, Messenger/metabolism RNA, Ribosomal/metabolism Sodium Dodecyl Sulfate Tritium

Carbon Isotopes Nucleoproteins RNA, Messenger RNA, Ribosomal Tritium Sodium Dodecyl Sulfate Puromycin Cytidine Adenosine