the 16s ( 18s ) ribosomal ribonucleic acids from a number of organisms were screened for the presence of ( some of ) the post-transcriptionally modified oligomers found in escherichia coli 16s ribosomal ribonucleic acid .
C0035701
ribosomal ribonucleic acids
C0035702
16s ribosomal ribonucleic acid