Quantitative Image Analysis Unit, Institut Pasteur, 75015 Paris, France.|Quantitative Image Analysis Unit, Institut Pasteur, 75015 Paris, France.|Quantitative Image Analysis Unit, Institut Pasteur, 75015 Paris, France.|Quantitative Image Analysis Unit, Institut Pasteur, 75015 Paris, France.|Quantitative Image Analysis Unit, Institut Pasteur, 75015 Paris, France.|Quantitative Image Analysis Unit, Institut Pasteur, 75015 Paris, France.|Quantitative Image Analysis Unit, Institut Pasteur, 75015 Paris, France.