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 orofacial cleft that is characterized by incomplete median clefts of both the lower lip and upper lip, double labial frenulum and fusion of the upper gingival and upper labial mucosa, in addition to poor dental alignment, and increased interdental distance between the lower and upper median incisors. (DO)