mRNA turnover studies applying labeled uridine require an evaluation of specific radioactivities of UTP and RNA-U.

Chromatography, Paper Cytosine Nucleotides/metabolism Electrophoresis, Paper HeLa Cells/cytology,metabolism Humans Isotope Labeling Kinetics Polyribosomes/metabolism RNA/analysis,biosynthesis,metabolism RNA, Messenger/biosynthesis,metabolism RNA, Ribosomal/biosynthesis,metabolism Spectrophotometry, Ultraviolet Time Factors Tritium Uracil Nucleotides/biosynthesis,metabolism Uridine/metabolism

Cytosine Nucleotides RNA, Messenger RNA, Ribosomal Uracil Nucleotides Tritium RNA Uridine