Fig. 2.

Genomic locations of the Or and Gr genes. The Or genes are shown above, and the Gr genes below, central lines representing each of the five major chromosome arms drawn to scale following Adams et al. (27). Genes with inferred independent origins are designated by thin lines, whereas clusters of related adjacent genes, or alternatively spliced genes, are shown by thick lines. Orientation of transcription is shown with an arrow; the arrows for the alternatively spliced products are contiguous. The fragmentary Or pseudogene is indicated as 98P. All gene locations and orientations are based on data from Release 3.1 of the genome.