Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Bat 400, 91400 Orsay, France.|Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Bat 400, 91400 Orsay, France.|Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Bat 400, 91400 Orsay, France.|Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Bat 400, 91400 Orsay, France.