\HeaderA{hgu95Achrom}{Annotation data for the Affymetrix HGU95A GeneChip}{hgu95Achrom}
\keyword{datasets}{hgu95Achrom}
\begin{Description}\relax
Data, in the form of environments for the Affymetrix U95A
chip.
\end{Description}
\begin{Usage}
\begin{verbatim}data(hgu95Achrom)
\end{verbatim}
\end{Usage}
\begin{Format}\relax
This data set provides an environment (treat as a hashtable)
with mappings from the Affymetrix
identifiers to chromosome number/name.
The environment functions like a hashtable and can be accessed using
\code{mget}.
If the returned value is \code{NA} then the current 
mapping was unable to identify this. Mappings and data sources are
constantly evolving so updating often is recommended.
\end{Format}
\begin{Source}\relax
The \code{AnnBuilder} package.
\end{Source}
\begin{Examples}
\begin{ExampleCode}
 data(hgu95Achrom)
 data(sample.exprSet.1)
 mget(geneNames(sample.exprSet.1)[330:340], env=hgu95Achrom, ifnotfound=NA)
\end{ExampleCode}
\end{Examples}