Systems Biology Unit, Institut Pasteur, 75724 Paris Cedex 15, France.|Systems Biology Unit, Institut Pasteur, 75724 Paris Cedex 15, France.|Systems Biology Unit, Institut Pasteur, 75724 Paris Cedex 15, France.|Systems Biology Unit, Institut Pasteur, 75724 Paris Cedex 15, France.|Systems Biology Unit, Institut Pasteur, 75724 Paris Cedex 15, France.|Systems Biology Unit, Institut Pasteur, 75724 Paris Cedex 15, France.|Systems Biology Unit, Institut Pasteur, 75724 Paris Cedex 15, France.