analysis of whole-cell rna pulse-labeled with ( me-3h ) methionine , or nucleolar rna pulse-labeled with ( 3h ) uridine in the presence of tubercidin ( inhibitor of rrna processing ) , as well as electron microscopy of high-molecular-weight rna fractions confirm that the 40-s precursor rrna ( 2.8 x 10 ( 6 ) ) is the primary transcript of the ribosomal genes in xenopus laevis .
C0035701
rrna
C0035553
ribosomal