RGD uses the Human Disease Ontology (DO, https://disease-ontology.org/) for disease curation across species. RGD automatically downloads each new release of the ontology on a monthly basis. Some additional terms which are required for RGD's curation purposes but are not currently covered in the official version of DO have been added. As corresponding terms are added to DO, these custom terms are retired and the DO terms substituted in existing annotations and subsequently used for curation.
Chronic and progressive loss of function in a transplanted lung. It involves a persistent decline in FEV1 (Forced expiratory volume in 1 second) of more than 20%, independent of the type of pulmonary function defect.