hybridization of 21 s ribosomal rna with duplex mtdna digested either with phage lambda-induced exonuclease or exonuclease iii of escherichia coli , shows that the 21-s ribosomal rna genes are located on the 5'-ends of each dna strand .
C0035701
ribosomal rna
C0035899
ribosomal rna genes