the nature of the arrangement of 16s and 23s ribosomal rna genes on the bacillus subtilis chromosome was studied by means of a cs ( 2 ) so ( 4 ) density gradient centrifugation technique after complexing dna- ( ribosomal ) rna hybrids with mercuric ions .
C0035704
23s ribosomal rna
C0035701
ribosomal