title: Metabolic heterogeneity of nuclear poly (A)-containing RNA in mouse liver.
abstract: The analysis by the approach to equilibrium labeling method has shown that the poly(A)+ fraction of liver hnRNA is not a uniform class of molecules, but is comprised of two distinct subclasses with half-lives of 5 and 60 min, while the poly(A)- hnRNA was metabolically homogeneous and turned over with a rather uniform half-life of 30 min. The results suggest that (a) poly(A) synthesis and addition is not limiting for the rate of hnRNA processing, and (b) there is a correlation between the kinetics of mRNA appearance in the cytoplasm and kinetic behavior of their possible nuclear precursors.
mesh_terms: D000818:Animals; D006207:Half-Life; D007700:Kinetics; D008099:Liver / Q000378:metabolism*; D008297:Male; D051379:Mice; D009963:Orotic Acid / Q000378:metabolism; D011061:Poly A / Q000378:metabolism*; D012313:RNA / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism
chemical_list: D012333:RNA, Messenger; D011061:Poly A; D009963:Orotic Acid; D012313:RNA