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Relative positions of lost and conserved introns to the 5' end of genes. In rats, lost introns (n = 86) are located closer to the 3' end of genes than conserved introns (n = 148,176) (Mann-Whitney U test, P = 0.001). In mice, the difference is not significant (45 lost introns versus 148,176 conserved introns, P = 0.162).
