[1] Departments of Medicine and of Anatomy and Cell Biology,
[2] College of Physicians and Surgeons,undefined
[3] Columbia University,undefined
[4] New York,undefined
[5] NY 10032,undefined
[6] USA,undefined
[7] Département de Biologie Cellulaire,undefined
[8] Institut Jacques Monod,undefined
[9] CNRS,undefined
[10] Université Paris 7,undefined
[11] Paris,undefined
[12] France,undefined