[i] ^aNumber of shared domain combinations for which one of the domains was found only in that species.

[ii] ^bNumber of shared domain combinations for which the domains were found in other species.

[iii] ^cNumbers of domains uniquely found in the species.

[iv] (V) Vertebrates; (C) Ciona (ascidian); (B) Branchiostoma (amphioxus); (S) Strongylocentrotus (sea urchin); (O) other species examined.