The Roles and Evolutionary Patterns of Intronless Genes in Deuterostomes

Table 2

Number of intronless genes with homologous genes in other taxonomic groups.

Taxonomic group	Sea urchin	Sea squirt	Zebrafish	Chicken	Platypus	Human
Archaea	764	625	524	385	143	1184
Bacteria	1303	873	1161	920	345	2524
Fungi	1492	1149	1067	817	413	2513
Plants	1480	1209	1070	809	441	2617
Metazoans	2447	1403	2027	1575	918	4807
Other eukaryotes	2337	1343	1897	1388	867	4055
ORFans	35	39	136	80	7	1416

ORFans [23]: homologues not found in other species.