\name{mapping2exon}
\alias{mapping2exon}
\title{This function maps on exon-level Probe Selection Region (PSR) starting for the file produced by function 
oneChannelGUI: Mapping exon level probe sets to Reference Sequences}
\description{
This function retrieve from RRE the PSR sequences associated to the exon-level probe sets
and all exons associated to the gene associated to PRS. Subsequently identify the exon  where PSR maps and procuces a 
fasta file were are located exon-level PSR and target exon.
The mapping is done using the countPattern function of the Biostrings package. Up to three mismathces are allowed in PSR
mapping on exonic sequence.
}
\usage{
mapping2exon()
}
\author{Raffaele A Calogero}
\keyword{ manip }