Determines the levels of a Directed Acyclic Graph (DAG)

Sample topGOdata and topGOresult objects
Functions which map gene identifiers to GO terms
Utility functions to work with Directed Acyclic Graphs (DAG)
Diagnostic functions for topGOdata and topGOresult objects.
A toy example of a list of gene identifiers and the respective p-values
Convenient function to compute p-values from a gene expression matrix.
Interfaces for running the enrichment tests
Grouping of GO terms into the three ontologies