\name{crosshybFilter}
\alias{crosshybFilter}
\title{Removing from exon array gene/exon level probe sets characterized by cross hybridization with other transcripts}
\description{
XHYB field is mainly an indicator 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
}
\usage{
crosshybFilter()
}
\author{ Raffaele A Calogero}
\keyword{ methods }