Boxes indicate the position of exons and numbers above the boxes indicate the number of the exons. Position of the probes used for Southern blot analysis. Zr is a 800 bp probe corresponding to the sequence located between the Hind III and Bam HI sites in the upstream red gene region. Br and Bg hybridize to exon 1 of the red and green genes respectively. Structure of the red, green and Tex 28 genes in this family with macular atrophy.
Solid line indicates the region that is present.
The dotted line in brackets indicates the deleted region. The position of the sequence shown in C corresponds to the structure of red, green and Tex 28 genes shown in A .