Figure 2From: CSEO – the Cigarette Smoke Exposure OntologySchematic representation of the main ontology classes and class provenance between BFO, ExO, and CSEO. Arrow legend: blue: is-a relations; yellow: ExO: is_associated_with; orange: ExO: interacts_with_an_exposure_stressor_via; brown: MGED: has_experiment_ design; violet: ExO: interacts_with.Back to article page