\name{EXTID2NAME}
\alias{EXTID2NAME}
\title{EXTID2NAME}
\usage{
  EXTID2NAME(geneID, organism)
}
\arguments{
  \item{geneID}{entrez gene ID}

  \item{organism}{one of "human", "mouse" and "yeast"}
}
\value{
  gene symbol
}
\description{
  mapping gene ID to gene Symbol
}
\author{
  Guangchuang Yu \url{http://ygc.name}
}