Figure 5

Phylogenetic comparison of exon 1A and 1B across different vertebrate species. The sequences of exons 1A (A) and 1B (B) (underlined), the 5' splice sites, composed by the last three nucleotides of the exon and the first five nucleotides of the intron (overlined), and the conserved GT nucleotides of the 5'splice sites (gray overlay) are shown. Last vertebrate specie where the 5'splice site is conserved is underlined.