although the rna in the free rnps turns over 25 % more rapidly than in the polysomes , labeling kinetics indicate that the rna containing poly ( a ) [ poly ( a ) ( + ) rna ] and the rna not containing poly ( a ) [ poly ( a ) ( - ) rna ] within each cytoplasmic compartment have very similar half-lives .
C0022702
kinetics
C0018517
half-lives