FIG. 2.

Sequences of the 3′ splice site mutants used in this study. The common 5′ splice site is shown at the left. The 3′ splice sites are shown at the right. The common branch site is shown in bold, and the mutated positions are underlined. The sites of in vivo splicing for each construct are indicated by the arrows. Major sites are indicated by dark arrowheads, and minor sites are indicated by light arrowheads. The numbers at the top refer to the distance in nucleotides between the branch site adenosine and the dashed lines.