Frequency of TRGs among the highest expressed genes in each tissue along with the total percentage of transcripts in the transcriptome
stemming from genes in each TRG class. Although TRGs make up a minority of genes in the top 1% of expression in all tissues, in tissues with novel
functions they account for a majority of expression. Tissues in the A column are those for which a statistically significant bias in expression of TRGs
exists, whereas tissues in the B column do not show bias in expression with TRG status. Orphans are genes found only in Apis mellifera. Bee, insect,
hymenoptera, and arthropod refer to TRG classes in which a gene is found only within this taxonomic group, whereas the O-TRG category refers to
genes with a complex but highly restricted pattern of presence and absence in different clades. Conserved genes are genes not in any of the TRG
categories (hence, widely found across organisms