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Structural comparison and reconstruction of the evolutionary history of Atp6v1H-encoding gene structure in insect species. Introns are numbered with respect to the T. adhaerens gene (yellow circles), considered the ancestral form. Putative intron gains are marked by red circles. The length of exons is indicated by the numbers within black boxes. The length of exons originating from exon fusion (due to intron loss) is represented as the sum of the length of the parental exons.
