Figure 2.

Schematic diagram of the genomic structure of mouse Opn4. The mouse Opn4 gene consists of 10 exons that span ∼9.6 kb of genomic DNA. Exons are shown as boxes and introns as lines; all are to scale except for exons 1–7 and regions of intronic DNA larger than 1 kb that are represented as slashed lines. Intron and exon sizes are marked. The start and stop codons in each gene are also indicated, as are the polyadenylation signals. The gene gives rise to two splice variants, the mOpn4L isoform generated by retention of intron 9 and mOpn4S by splicing to exon 10. The products generated by these two events are shown.