Figure 4

Sequences and alignments of alternatively spliced exons contributing to the HOOK domain. Four distinct exons occur in zebrafish β2 transcript variants which differentially join to exon 6 to encode the HOOK domain (see Fig. 1C). (A-C) Three of these exons are alternatively spliced in β2.1, whereas the sequence in (D) was the sole sequence found in all β2.2 transcripts. Species names are abbreviated as in Figure 3.