in prolonged experiments in which rats were injected with 14c-orotic acid for 7-10 days with subsequent measurements ( during 1-2 months ) of the label in various rat liver rna fractions and in the acid-soluble pool , a superstable nuclear rna fraction was found ( t1/2-4.2 days in quiescent rat liver and 4.3 days in regenerating rat liver ) .
C0035668
rna
C0035700
nuclear rna