\HeaderA{hgu2beta7LOCUSID}{Mappings between probe identifiers and LocusLink identifiers}{hgu2beta7LOCUSID}
\keyword{datasets}{hgu2beta7LOCUSID}
\begin{Description}\relax
LocusLink identifiers are unique ids used by NCBI
\url{http://www.ncbi.nlm.nih.gov/LocusLink/} to represent genetic loci
and link to curated sequence and descriptive
information. hgu2beta7LOCUSID maps probe identifiers to LocusLink
identifiers for genes represented by the probe identifiers.
\end{Description}
\begin{Details}\relax
Mappings of probe ids to LocusLink ids are achieved through the
linkage between probe ids to manufacturer/user provided ids contained
in hgu2beta7ACCNUM. LocusLink ids are first mapped to
manufacturer/user provided ids using file(s) provided by Locuslink and in
some cases UniGene and other available sources and then linked to
probe ids based on the mappings between probe ids and
manufacturer/user provided ids.  

When a given probe id was mapped to different LocusLink ids by
different sources, the one agreed by most sources was selected. When no
agreement was achieved among sources, the one of the smallest numeric
value was selected. 

Mappings were based on data provided by:

LocusLink:\url{ftp://ftp.ncbi.nih.gov/refseq/LocusLink/LL_tmpl.gz}. Built: February 16, 2005

Package built: Wed Feb 16 23:32:20 2005
\end{Details}
\begin{References}\relax
\url{http://www.ncbi.nlm.nih.gov}
\end{References}
\begin{Examples}
\begin{ExampleCode}
    # Convert the environment to a list
    xx <- as.list(hgu2beta7LOCUSID)
    # Remove probe ids that do not map to any LOCUSID
    xx <- xx[!is.na(xx)]
    if(length(xx) > 0){
        # The LOCUSIDs for the first two elements of XX
        xx[1:2]
        # Get the first one
        xx[[1]]
    }
\end{ExampleCode}
\end{Examples}

