T/C ratio of third codon position in Ophiura albida (ophiuroids) and Antedon mediterranea (crinoids).
Genes encoded on the minor sense strand are shown in bold type.
| Ophiura albida (T/C ratio of third codon position) | Antedon mediterranea (T/C ratio of third codon position) | |
| cox1 | 4,4 | 48,1 |
| nd4L | 9,75 | 19 |
| cox2 | 2,7 | 149 |
| atp8 | 6,3 | 30 |
| atp6 | 2,5 | 25,6 |
| cox3 | 2,2 | 27,8 |
| nad3 | 2,6 | 32,5 |
| nad4 | 2 | 25,5 |
| nad5 | 2 | 34,8 |
| nad1 | 2 | 3,8 |
| nad2 | 3,5 | 5,6 |
| cytb | 1,8 | 17,2 |
| nd6 | 5,6 | 2,5 |
| Ø major sense strang | 2,5 | 30,3 |
| Ø minor sense strang | 5,6 | 3,8 |