bookmark HPO / Human Phenotype Ontology Provides a standardized vocabulary of phenotypic abnormalities encountered in human disease. HPO is developed using the medical literature, Orphanet, DECIPHER, and OMIM. HPO contains approximately 11,000 terms and over 115,000 annotations to hereditary diseases. HPO also provides a large set of HPO annotations to approximately 4000 common diseases. HPO can be used for clinical diagnostics in human genetics (Phenomizer), bioinformatics research on the relationships between human phenotypic abnormalities and cellular and biochemical networks, for mapping between human and model organism phenotypes, and for providing a standardized vocabulary for clinical databases, among many other things.