Table 1.

Characterization of differentiae added by unmapped DO concepts

Type of differentiae	Count
Morphology (e.g. follicular dendritic cell sarcoma)	831
Morphology and anatomic site	520
Specific subtype (e.g. spinocerebellar ataxia type 1)	253
Anatomic site (e.g. intramuscular hemangioma)	147
Morphology and period of onset	61
Period of onset (e.g. pediatric osteosarcoma)	45
Chromosomal location and anomaly	45
Complex syndrome (e.g. agnathia-otocephaly complex)	42
Subtype	42
Organism (e.g. screw worm infectious disease)	30
Others	191