An R object that contains information on Human Phenotype ONset and clinical course terms. These terms are organised as a direct acyclic graph (DAG), which is further stored as an object of the class 'igraph' (see http://igraph.org/r/doc/aaa-igraph-package.html). This data is prepared based on http://purl.obolibrary.org/obo/hp.obo.
an object of S4 class Onto. It has slots for "nodeInfo" and "adjMatrix"
nodeInfo: an object of S4 class InfoDataFrame,
describing information on nodes/terms including: "term_id" (i.e. Term
ID), "term_name" (i.e. Term Name), "term_namespace" (i.e. Term
Namespace), and "term_distance" (i.e. Term Distance: the distance to
the root; always 0 for the root itself)
adjMatrix: an object of S4 class AdjData,
containing adjacency data matrix, with rows for parent (arrow-outbound)
and columns for children (arrow-inbound)
Robinson et al. (2012) The Human Phenotype Ontology: a tool for
annotating and analyzing human hereditary disease. Am J Hum
Fang H and Gough J. (2013) dcGO: database of domain-centric ontologies on functions, phenotypes, diseases and more. Nucleic Acids Res, 41(Database issue):D536-44.