hybridization with radioactive ribosomal rna ( rrna ) and competition with nonradioactive rrna show that of the three predominent ecor1-yeast dna species , the 2.5 kb species hybridizes only with the 25s rrna while the lighter 1.8 kb species hybridizes with the 18s rrna .
C0035701
rrna
C0035703
18s rrna