1. Department of Molecular Genetics and Biotechnology, and
2. Department of Molecular Cell Biology, Institute of Molecular Embryology and Genetics, Kumamoto University School of Medicine, Kumamoto, Japan.,
3. Department of Membrane and Ultrastructure Research, The Hebrew University‐Hadassah Medical School, Jerusalem P.O.B. 12272, Israel 91120.,
4. Zentrum fur Molekulare Biologie, Universitat Heidelberg, Heidelberg, Germany.