1. College of Physicians and Surgeons, Department of Pathology, and Department of Anatomy and Cell Biology, Columbia University, New York, NY 10032
2. Ecole Supérieure de Biotechnologie de Strasbourg, Centre National de la Recherche Scientifique, UMR 7100, Parc d'Innovation, Boulevard Sébastien Brandt, BP 10413, 67412 ILLKIRCH Cedex, France