\name{org.Mm.egUCSCKG}
\alias{org.Mm.egUCSCKG}
\title{Map UCSC "Known Gene" accession numbers with Entrez Gene identifiers}  
\description{ 
  org.Mm.egUCSCKG is an R object that contains mappings between 
  Entrez Gene identifiers and UCSC "Known Gene" accession numbers.    
}
\details{
  This object is a simple mapping of Entrez Gene identifiers
  \url{http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=gene} to UCSC
  "Known Gene" Accession Numbers.  Please be advised that UCSC "Known
  Genes" are not more like putative transcripts transcript identifiers
  than they are gene identifiers.  

  Mappings were based on data provided by: UCSC Genome Bioinformatics (Mus musculus)  
  ftp://hgdownload.cse.ucsc.edu/goldenPath/currentGenomes/Mus\_musculus  
  With a date stamp from the source of: 2009-Jul5
}

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