Figure 3.

Alternative splicing at the tandem donor of exon 21 of (a) human STAT3 and (b) mouse Stat3. Electropherograms are shown for direct sequencing of RT-PCR amplicons (e+i) and sequencing of isolated clones representing e and i transcripts (e and i, respectively). The cursor is positioned on the nucleotide upstream of the conserved GTAGTT motif. Numbers and ratios of clones representing e and i transcripts are given for human and mouse kidney (e:i).