1. Centre of Electron Microscopy, University of Lausanne, 1005 Lausanne, Switzerland
2. Dipartimento di Biologia Animale, Laboratorio di Istologia, and Centro di Studio per l’Istochimica del CNR, University of Pavia, 27100 Pavia, Italy
3. Istituto di Istologia ed Analisi di Laboratorio, University of Urbino, 61029 Urbino, Italy
4. Institut de Pharmacologie et de Biologie Structurale, CNRS, 31077 Toulouse, France
5. Weis Center for Research, Geisinger Clinic, Danville, PA 17822, USA