| the 10 kb drosophila virilis 28s rdna intervening sequence is flanked by a direct repeat of 14 base pairs of coding sequence. | most repeat units of rdna in drosophila virilis are interrupted in the 28s rrna coding region by an intervening sequence about 10 kb in length; uninterrupted repeats have a length of about 11 kb. we have sequenced the coding/intervening sequence junctions and flanking regions in two independent clones of interrupted rdna, and the corresponding 28s rrna coding region in a clone of uninterrupted rdna. the intervening sequence is terminated at both ends by a direct repeat of a fourteen nucleotide s ... | 1980 | 6253902 |