We then plot the percentage of
total expression in the top 1% that stems from each category.
The categories of TRGs are Orphans, which are those found
only in honey bee genome; arthropod, insect, hymenoptera,
and bee, which are those found only in genomes of the taxonomic
group, respectively; other TRG (abbreviated as OTRG),
which are those showing a complex presence/absence
pattern; and conserved (see more details in Materials and
Methods).