1. Department of Pediatrics and Developmental Biology; Graduate School of Medicine; Tokyo Medical and Dental University; Tokyo; Japan
2. Section of Biochemistry; Department of Mechanism of Aging; National Institute for Longevity Sciences; National Center for Geriatrics and Gerontology; Aichi; Japan
3. Virology Division; National Cancer Center Research Institute; Tokyo; Japan
4. Department of Pathological Biochemistry; Medical Research Institute; Tokyo Medical and Dental University; Tokyo; Japan