investigation of the cellular location of pulse-labelled ribosomal rna precursor and mature ribosomal rna shows that both the 37-s precursor rna , common to both 17-s and 26-s rrna , as well as the 29-s rna , the direct precursor of 26-s rrna , are located in the nucleus .
C0035701
rrna
C0035668
rna