Figure 5From: Sequence determinants in human polyadenylation site selectionUracil frequencies in a 11 nt window in the vicinity of alternative poly(A) sites, distinguishing proximal sites from distal sites. (a) : "strong" poly(A) sites (129 proximal, 499 distal); (b) : "weak" poly(A) sites (655 proximal, 210 distal).Back to article page