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Representation of U12 introns in the U12DB. The total number of U12 introns and the number of each subtype are shown in the columns to the right of the species tree. Grand totals are shown at the bottom. The number of U12 introns in the database for each species does not necessarily reflect the actual number of U12 introns in its genome. Note that branch lengths are not to scale. Branch order was obtained from the NCBI taxonomy browser.
