\name{org.Mm.egMGI}
\alias{org.Mm.egMGI}
\alias{org.Mm.egMGI2EG}
\title{Map MGI gene Acession numbers with Entrez Gene identifiers}  
\description{ 
  org.Mm.egMGI is an R object that contains mappings between 
  Entrez Gene identifiers and Jackson Laboratory MGI 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 MGI
  gene Accession Numbers.

  Mappings were based on data provided by: Entrez Gene  
  ftp://ftp.ncbi.nlm.nih.gov/gene/DATA  
  With a date stamp from the source of: 2009-Sep1
}

\examples{
    x <- org.Mm.egMGI
    # Get the entrez gene IDs that are mapped to an MGI ID
    mapped_genes <- mappedkeys(x)
    # Convert to a list
    xx <- as.list(x[mapped_genes])
    if(length(xx) > 0) {
      # Get the MGI gene IDs for the first five genes
      xx[1:5]
      # Get the first one
      xx[[1]]
    }
    #For the reverse map MGI2EG:
    # Convert to a list
    xx <- as.list(org.Mm.egMGI2EG)
    if(length(xx) > 0){
       # Gets the entrez gene IDs for the first five MGI IDs
       xx[1:5]
       # Get the first one
       xx[[1]]
    }
}
\keyword{datasets}