the cross-hybridization observed with 1.3 and 0.7 x 10 ( 6 ) molecular weight ribosomal rnas and dna , which varies greatly with different plant species , is not due to contamination of the ribosomal rnas , and is specific for the ribosomal dna of each species , probably largely restricted to those sequences coding for the two stable ribosomal rnas .
C0012854
dna
C0012933
ribosomal dna