highly significantp < 0.001
Compared to all exons in the transcriptome of each species, exons immediately downstream of the REPAGs are significantly enriched with non-constitutive ones in 198 species/lineages ( p < 0.05, Figure 3 and Supplementary Table S4 ), and highly significant ( p < 0.001) in 123 lineages of 106 unique species.