our results further indicate that , although an estimated 75 % of the ribosomal rna genes in drosophila virilis are interrupted by an intron in the 28sb gene sequence ( barnett , t & rae , p m m , cell 16 ( 1979 ) 763 ) [ 1 ] , none of those genes appear to be transcribed to any appreciable extent in the tissues examined .
C0021920
intron
C0007634
cell