\name{org.At.tairENTREZID}
\alias{org.At.tairENTREZID}
\title{Map TAIR identifiers with Entrez Gene identifiers}  
\description{ 
  org.At.tairENTREZID is an R object that contains mappings between 
  TAIR accession numbers and NCBI Entrez Gene identifiers.    
}
\details{
  This object is a simple mapping of Entrez Gene identifiers
  \url{http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=gene} to
  TAIR Accession Numbers.

  Mappings were based on data provided by:
  \url{ftp://ftp.ncbi.nlm.nih.gov/gene/DATA}
}

\examples{
    x <- org.At.tairENTREZID
    # Get the ORF IDs that are mapped to an Entrez Gene ID
    mapped_genes <- mappedkeys(x)
    # Convert to a list
    xx <- as.list(x[mapped_genes])
    if(length(xx) > 0) {
      # Get the Entrez gene IDs for the first five genes
      xx[1:5]
      # Get the first one
      xx[[1]]
    }
}
\keyword{datasets}