Table 1.

Numbers of OR Genes in 14 Nonmammalian Chordate Species

Common Name	Species Name	Fa	Ta	Pa	Total
Amphioxus	Branchiostoma floridae	31	3	9	43
Ascidian	Ciona intestinalis, Ciona savignyi	0	0	0	0
Larvacean	Oikopleura dioica	0	0	0	0
Sea lamprey	Petromyzon marinus	32	8	27	67
Elephant shark	Callorhinchus milii	1	1	0	2
Zebra fish	Danio rerio	154	1	21	176
Medaka	Oryzias latipes	68	6	24	98
Stickleback	Gasterosteus aculeatus	102	5	52	159
Fugu	Takifugu rubripes	47	39	39	125
Spotted green puffer fish	Tetraodon nigroviridis	11	4	19	34
Western clawed frog	Xenopus tropicalis	824	200	614	1638
Lizard	Anolis carolinensis	112	4	30	146
Chicken	Gallus gallus	211	89	133	433

^aF, T, and P indicate the numbers of functional genes, truncated genes, and pseudogenes, respectively. A functional gene is a sequence that does not contain any nonsense or frameshift mutations or long deletions and has initiation and stop codons at proper positions. A truncated gene is a part of an intact sequence that is located at a contig end. These numbers do not include group θ1, θ2, κ, and λ genes (see Results).