\HeaderA{org.Hs.egCHRLOC}{Entrez Gene IDs to Chromosomal Location}{org.Hs.egCHRLOC}
\keyword{datasets}{org.Hs.egCHRLOC}
\begin{Description}\relax
org.Hs.egCHRLOC is an R object that maps entrez gene identifiers to the
starting position of the gene. The position of a gene is
measured as the number of base pairs.
\end{Description}
\begin{Details}\relax
Each entrez gene identifier maps to a named vector of chromosomal locations,
where the name indicates the chromosome. 

Chromosomal locations on both the sense and antisense strands are
measured as the number of base pairs from the p (5' end of the sense
strand) to q (3' end of the sense strand) arms. Chromosomal locations on the
antisense strand have a leading "-" sign (e. g. -1234567). 

Since some genes have multiple start sites, this field can map to
multiple locations.

Mappings were based on data provided by: UCSC Genome Bioinformatics (Homo sapiens) ( ftp://hgdownload.cse.ucsc.edu/goldenPath/currentGenomes/Homo\_sapiens ) on 2006-Apr14
\end{Details}
\begin{Examples}
\begin{ExampleCode}
        x <- org.Hs.egCHRLOC
        # Get the entrez gene identifiers that are mapped to chromosome locations
        mapped_genes <- mappedkeys(x)
        # Convert to a list
        xx <- as.list(x[mapped_genes])
        if(length(xx) > 0) {
          # Get the CHRLOC for the first five genes
          xx[1:5]
          # Get the first one
          xx[[1]]
        }
\end{ExampleCode}
\end{Examples}

