Repeat analysis of D. virilis contigs compared to the D.
melanogaster genome. The repeat density, defined as the
percentage of total sequence (in base-pairs) that has been
annotated as repetitive has been calculated using the D. virilis
fosmid sequence obtained in this study and homologous regions
from D. melanogaster (see Materials and methods). D.
melanogaster and D. virilis have a very similar low repeat
density on the major chromosome arms, and a similar but much
higher repeat density on the dot chromosomes. (a) Percent repeat
for each type identified by RepeatMasker using RebBase 8.12 with
additional repeats identified in a BLASTN all-by-all comparison
of the fosmid sequences presented here. (b) Percent repeat for
each type identified by RepeatMasker using the Superlibrary (see
text for description). The dot chromosome of D. melanogaster has
about three times more DNA transposon sequence than does the D.
virilis dot chromosome. 'Unknown' repeats are those from both
RebBase 8.12 and the D. virilis PILER-D