1. Laboratory of Animal Molecular Morphology, Department of Animal Science, Graduate School of Agricultural Science, Kobe University, Hyogo, Japan
2. Laboratory of Histophysiology, Department of Animal Science, Graduate School of Agricultural Science, Kobe University, Hyogo, Japan
3. Laboratory of Microbiology and Immunology, Department of Animal Science, Graduate School of Agricultural Science, Kobe University, Hyogo, Japan
4. Life Science Research Center, University of Toyama, Toyama, Japan