1. Department of Anatomy and Cell Biology, College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea.
2. BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science, College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea.
3. Department of Anatomy, College of Veterinary Medicine, Kangwon National University, Chuncheon 24341, Korea.
4. Korea Mouse Phenotyping Center, College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea.