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 ...19806253902
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