The sequence logos of AP1 TFBS and the donor site. Sequence logos of the AP1 TFBS and the donor splice site. The height of bases represents the information content at each position of a sequence motif. (a) the logo of AP1 TFBS. Note that the positions 4 and 6 of AP1 TFBS are not perfectly conserved. (b) the logo of donor splice site. The positions 0 and 1 are perfectly conserved. The logo plot was created by WebLogo .