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.
An osteochondrodysplasia that is characterized by shortened long bones in the arms and legs that are unusually wide at the ends, flattened vertebrae with a characteristic pinched or pear shape, and a very narrow chest in infants with short, wide ribs and a round and prominent abdomen. (DO)