1. Laboratory of Developmental Chronobiology, Children's Service, Massachusetts General Hospital, and Departments of Pediatrics and Program in Neuroscience, Harvard Medical School, Boston, MA 02114.
2. Departments of Pathology (Neuropathology Division) and Anatomy and Cell Biology, Tufts University School of Medicine, Boston, MA 021O11, and Human Brain Tissue Resource Center, McLean Hospital/Harvard Medical School, Belmont, MA 02178.