Figure 2 of
Cassar, Mol Vis 2004;
Figure 2. CNGA3 gene and transcript structures
Top line, gene structure, showing introns as thin lines connecting exons. Exon 1 is smaller to indicate that it does not contain coding sequence; the exons are numbered in accordance with the report by Kaupp et al. . The exonic structures of three different human CNGA3 cDNAs are depicted along with bovine cDNA  for comparison.