Figure 3.

Organization of the Y1 and Y5 genes relative to one another in coelacanth, human, and chicken. Exons are shown as tall boxes for the coding region and low boxes for the 5′- and 3′-untranslated regions where known. The 3′-untranslated region is shown until the position of the first consensus poly(A) signal. The size of the intron in the coding region of Y1 is shown. In all three species, the genes have a “head-to-head” orientation and may share regulatory upstream elements. The distance between the coding regions of the two genes are shown, but it has not yet been fully explored where promoters and any separate 5′-untranslated exons may be located.