1. Department of Molecular Biology, Nagoya City University School of Medicine, Nagoya 467‐8601, Japan,
2. Department of Anatomy, Medical Faculty, University of Szeged, Szeged, Hungary,
3. Choju Medical Institute, Fukushimura Hospital, Toyohashi 441‐8124, Japan,
4. Department of Biology, Gyula Juhasz College, University of Szeged, Szeged, Hungary
5. Department of Physiology, Hamamatsu University School of Medicine, Hamamatsu, Japan