\HeaderA{GOMFANCESTOR}{Annotation of GO identifiers by the GO identifiers of their
ancestors}{GOMFANCESTOR}
\keyword{datasets}{GOMFANCESTOR}
\begin{Description}\relax
This is an R environment (hash table) mapping GO ids to all the GO
ids of their ancestors under molecular function (MF). Ancestors are
defined as the direct or indirect parent/grand parent nodes of a
given node for a GO id based on the directed acyclic graph defined by
Gene Ontology Consortium. GO terms for ancestor nodes are more general
\end{Description}
\begin{Details}\relax
GO ids are keys and the corresponding ancestor GO ids are
values. Values are vectors of GO ids for all the ancestor of the key
GO id. GO ids that do not have any offspring node are assigned NA as
the values.  

Molecular function is defined as the tasks performed by individual
gene products; examples are transcription factor and DNA helicase as
defined by Gene Ontology Consortium.  

Mappings were based on data provided:

Gene Ontology:\url{http://www.godatabase.org/dev/database/archive/2004-09-01/go_200409-termdb.xml.gz}. Built: 2004-09-01

Package built: Mon Jan 10 19:19:56 2005
\end{Details}
\begin{References}\relax
\url{http://www.geneontology.org/} and
\url{http://www.ncbi.nlm.nih.gov/LocusLink}
\end{References}
\begin{Examples}
\begin{ExampleCode}
  require("GO", character.only = TRUE) || stop("GO unavailable")
  # Convert the environment object to a list
  xx <- as.list(GOMFANCESTOR)
  # Remove GO ids that do not have any ancestor
  xx <- xx[!is.na(xx)]
  if(length(xx) > 0){
    # Get the ancestor GO ids for the first two elents of xx
    goids <- xx[1:2]
  }
\end{ExampleCode}
\end{Examples}

