\HeaderA{crosshybraex.annotation}{Cross hybriduzation data for exon CORE subset of rat exon array 1.0 ST}{crosshybraex.annotation}
\keyword{datasets}{crosshybraex.annotation}
\begin{Description}\relax
These data are derived from Affymetrix annotation file raex10stv1na24rn4.
XHYB field is mainly an indictor of weak assignment between a transcript cluster and the assigned mRNA, suggesting a potential crosshyb,
CRSSHYB is a measure of the promiscuity of the probes within a probe set among transcribed sequences.
\begin{enumerate}
\item 1 unique. All probes in the probe set perfectly match only one sequence in the putatively
transcribed array design content. The vast majority of probe sets are unique.  
\item 2 similar.   All the probes in the probe set perfectly match more than one sequence in 
the putatively transcribed array design content.
\item 3 mixed.The probes in the probe set either perfectly match or partially match more than one sequence 
in the putatively transcribed array design content. 
\end{enumerate}
XHYB and CRSSHYB  are used to remove probe sets characterized by multiple hybridization of exon probes
Cross-hybridization potential of the probe set determined at the time of array design. 
This field is based on computational sequence alignment against all known and 
putatively transcribed array design content, which includes all 
potentially transcribed regions of the genome and other 
transcribed sequences that could not be mapped to the genome.
\end{Description}
\begin{Usage}
\begin{verbatim}crosshybraex.annotation\end{verbatim}
\end{Usage}
\begin{Format}\relax
A data frame with 9 observations: EPROBESETID, GPROBESETID, ACC, XHYB, CHR, STRAND, START, STOP, CROSSHYBTYPE
\end{Format}
\begin{References}\relax
Affymetrix web site
\end{References}

