- Plant Trait Ontology CC-BY-4.0
Plant Trait Ontology project; original artifact license CC-BY-4.0 (http://creativecommons.org/licenses/by/4.0/); https://obofoundry.org/ontology/to.html
http://purl.obolibrary.org/obo/TO_0000539 ; https://purl.obolibrary.org/obo/to.owl ; snapshot SHA-256 369d261d9262fe750c5b1593f92ee3028111e77104b2cfd5a03551cbcb2a16bd ; exact artifact license http://creativecommons.org/licenses/by/4.0/ ; retrieved 2026-11-07