Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, United States of America.|Cellular and Systems Neurobiology Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States of America.|Department of Mathematics and Statistics, Georgia State University, Atlanta, United States of America.|Cellular and Systems Neurobiology Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States of America.|Cellular and Systems Neurobiology Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States of America.|Department of Mathematics and Statistics, Georgia State University, Atlanta, United States of America.|Cellular and Systems Neurobiology Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States of America.|Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, United States of America.