| Name | Metaprefix | URI |
|---|---|---|
| AOPWiki (Key Event Relationship) | aop.relationships |
https://aopwiki.org/relationships/5 |
| Bioregistry | bioregistry |
https://bioregistry.io/aop.relationships:5 |
| Identifiers.org | miriam |
https://identifiers.org/aop.relationships:5 |
| Name-to-Thing | n2t |
https://n2t.net/aop.relationships:5 |