from the electrophoretic patterns of nucleolar rna 's of both groups of rat livers labeled with [ 14c ] orotic acid , the time courses of the specific activities of nucleolar 45s , 32s , and 28s rrna 's were analysed and the half-life of each nucleolar rna in both groups of rat livers was determined .
C0035668
rna 's
C0035701
rrna 's