the organization of the ribosomal genes in genomic dna of individual animals and of a pool of animals was studied by blot-hybridization of the restriction fragments , using as probes nick-translated 32p-labelled cloned ribosomal dna fragments or 18s and 26s sea-urchin ribosomal rna .
C0035553
ribosomal
C0035701
ribosomal rna