Skeleton files to display *.ct-like format in RNAviz2:
| For all Calcarea and demosponges with the common metazoan SSU rRNA secondary structure . | |
| SSUrRNA_HAPL4.skl | Clade IV marine Haplosclerids with additional helices inserted in E23_1 and 43. |
| SSUrRNA_HAPL3.skl | Clade III marin Haplosclerids with additional helicee inserted in E23_1, E23_14 and 43. |
| SSU rRNA_HEX.skl | Hexactinelids with two additional helices inserted in E23_1. |