A 2-year-old boy with hypoactivity of neonatal onset and profound developmental delay

Masashi Mizuguchi, Masayuki Itoh, Hiroshi Ozawa and Yukihiko Morikawa Department of Pediatrics, Graduate School of Medicine, University of Tokyo, Department of Mental Retardation and Birth Defect Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira and Departments of Pediatrics and Pathology, Tokyo Metropolitan Hachioji Children’s Hospital, Hachioji, Japan