- The Vertebrate Trait Ontology CC-BY-4.0
The Vertebrate Trait Ontology project; original artifact license CC-BY-4.0 (https://creativecommons.org/licenses/by/4.0/); https://obofoundry.org/ontology/vt.html
http://purl.obolibrary.org/obo/VT_0000639 ; https://purl.obolibrary.org/obo/vt.owl ; snapshot SHA-256 4752e9bb4008d888dcd75b1ddbd266ab67fd11ed4a9e9e0a7b9d8e39c510f351 ; exact artifact license https://creativecommons.org/licenses/by/4.0/ ; retrieved 2026-11-07