Purification and properties of two messenger-discriminating species of E. coli initiation factor 3.

Aminoacylation Bacterial Proteins/biosynthesis Carbon Isotopes Centrifugation, Density Gradient Chromatography, DEAE-Cellulose Chromatography, Gel Chromatography, Ion Exchange Coliphages/metabolism Electrophoresis, Disc Escherichia coli/cytology,metabolism Isoelectric Focusing Molecular Weight Peptide Initiation Factors/isolation & purification Phosphorus Isotopes Protein Biosynthesis RNA, Bacterial/metabolism RNA, Messenger/metabolism RNA, Viral/metabolism Ribosomes/metabolism Spectrophotometry, Ultraviolet Time Factors Tritium

Bacterial Proteins Carbon Isotopes Peptide Initiation Factors Phosphorus Isotopes RNA, Bacterial RNA, Messenger RNA, Viral Tritium